Mechanisms of action – Acupuncture and neurotransmitters in the body

We know from research that acupuncture affects many bodily systems, so here we shall take a look at the nervous system and its chemical messengers: neurotransmitters.

In simple terms, a neurotransmitter is a chemical substance released at the end of a nerve fibre, which diffuses across a synapse (junction between nerves), and transmits the signal along to a nerve fibre or muscle fibre, for example.

This process is involved in the transmission of pain signals in the body, and is also one of the well-understood mechanisms of acupuncture pain relief. The role of acupuncture in modulating neurotransmitters involved in pain has been well discussed, as well as researched in great detail.

Specific neurotransmitters, and acupuncture’s effect on them:

Model of a brain and nerve cell

Zhang et al (2022) give the research on those in turn; opioid peptides; γ-Aminobutyric acid (GABA); Norepinephrine; 5-Hydroxytryptamine (5-HT) aka serotonin; and glutamate.  

The researchers look in detail about what acupuncture research has shown in terms of mechanisms of action for each neurotransmitter, and to summarise:

  • Endogenous opioid peptides (a type of neurotransmitter) are produced in the body as a direct result of acupuncture treatment. These have been shown in numerous studies to have a positive effect on analgesia (pain relief).  By name, these are enkephalins, endomorphins, dynorphins, and nociceptin, and they are the body’s own natural painkilling substances
  • γ-Aminobutyric acid (GABA); this is an inhibitory neurotransmitter in the central nervous system.  It has a painkilling effect. It has been demonstrated through research studies that acupuncture can upregulate GABA expression; another part of how acupuncture helps with pain
  • Norepinephrine (noradrenalin in the UK); another neurotransmitter, the release of which is enhanced by acupuncture. Norepinephrine is also capable of inhibiting pain in the body
  • 5-Hydroxytryptamine (5-HT), or serotonin; is a neurotransmitter that is involved in analgesia (pain relief).  5-HT is secreted in the brain during acupuncture administration, making it another known mechanism of action for acupuncture analgesia
  • Glutamate; a central nervous system neurotransmitter, is involved in the transmission of pain signals in the spinal cord.  Acupuncture downregulates glutamate, as part of how it provides pain relief

Overall a combination of demonstratable mechanisms is clearly at play, and can be seen and measured to be the cause of why acupuncture can help pain. 

How were the studies done?

Research models

Studies on mechanisms of acupuncture analgesia are based on animal models, where levels of neurotransmitters and their effects are measured objectively, removing the possibility of placebo effect as a cause of pain relief. 

Human trials are also used where this is measurable in an ethical and objective way, through fMRI (brain scans showing which areas light up), and blood levels of neurotransmitters as well as pain ratings.

A complicated picture

There are other analgesic mechanisms of acupuncture besides those above, and it is hard to unpick the overall contributions of each, and it may be the case that it depends upon the region targeted, quality of pain and other factors.  For this reason, the acupuncturist’s experience and overall assessment of the individual on the day of treatment contribute to the overall outcome.

Reference:

Zhang, M., Shi, L., Deng, S., Sang, B., Chen, J., Zhuo, B., Qin, C., Lyu, Y., Liu, C., Zhang, J. and Meng, Z., 2022. Effective oriental magic for analgesia: acupuncture. Evidence-Based Complementary and Alternative Medicine, 2022. https://www.hindawi.com/journals/ecam/2022/1451342/

Bibliography:

Li, S.K., Liao, W.D., Zhao, J. and Cao, X.W., 2020. Effects of acupuncture on plasma endogenous opioid peptides in patients with stroke-associated headache in convalescence. Zhen ci yan jiu= Acupuncture Research45(12), pp.995-999.

Lin, J.G., Kotha, P. and Chen, Y.H., 2022. Understandings of acupuncture application and mechanisms. American Journal of Translational Research14(3), p.1469.

Petti, F.., Bangrazi, A., Liguori, A., Reale, G. and Ippoliti, F., 1998. Effects of acupuncture on immune response related to opioid-like peptides. Journal of Traditional Chinese Medicine 18(1), pp.55-63.

Trento, M.M.S., Moré, A.O.O., Duarte, E.C.W. and Martins, D.F., 2021. Peripheral receptors and neuromediators involved in the antihyperalgesic effects of acupuncture: a state-of-the-art review. Pflügers Archiv-European Journal of Physiology473(4), pp.573-593.

Wang, W.S., Xi, H.Y., Fu, G., Fan, X.Z. and Guo, M., 2022. Study on the Mechanism of Electroacupuncture in the Treatment of Neuropathic Pain Based on Vesicular Glutamate Transporter 2/Toll Like Receptor 4 Signal Pathway. Indian Journal of Pharmaceutical Sciences, pp.31-37.

Wu, W.Z., Zheng, S.Y., Liu, C.Y., Qin, S., Wang, X.Q., Hu, J.L., Wan, Q.Y., Zhao, Y.N. and Xi, H.Q., 2021. Effect of Tongdu Tiaoshen acupuncture on serum GABA and CORT levels in patients with chronic insomnia. Zhongguo Zhen jiu= Chinese Acupuncture & Moxibustion41(7), pp.721-724.

Helen
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Electro Acupuncture

Electro acupuncture (EA) is an adjunct of acupuncture practise where a small electrical current is passed between pairs of acupuncture needles.  There is usually a slight sensation of buzzing or vibration associated with the electrical pulses, but the procedure is relatively pain free.

EA is a safe and effective form of therapy, which studies and systematic reviews, have shown may benefit patients for the symptoms of a wide range of conditions, in particular:

  • Nausea prevention: post chemotherapy (Zhang et al, 2014); post surgery (Ho et al, 1990); in hyperemesis gravidarum (severe “morning sickness” of pregnancy) (Ezzo et al, 2006);
  • Pain: symptomatic knee pain in rheumatoid arthritis (Casimiro et al 2005); post-operative pain and other recovery benefits post-operatively (Hayhoe, 2010, Lin et al, 2002); labour pain (Qu et al, 2007); low back pain; fibromyalgia (Delize et al. 1992); nerve pain, inflammatory pain and organ pain (Zhang et al, 2014)
  • Dental pain (Tavares et al 2007; Sim et al 2002)
  • Urinary retention after spinal injury (Liu et al 2011); urinary stress incontinence (Zhishun et al, 2017)
  • Tension-type headache (Xue et al, 2004); reducing the frequency of migraine (Xu et al, 2018)
  • Tennis elbow (Yeung et al, 2003); calcific tendonitis (Papadopoulos et al, 2019); achilles tendonitis (Yu et al, 2015)

The acupuncturist may use EA alongside other acupuncture techniques where it is indicated.

References:

Casimiro, L., Barnsley, L., Brosseau, L., Milne, S., Welch, V., Tugwell, P. and Wells, G.A., 2005. Acupuncture and electroacupuncture for the treatment of rheumatoid arthritis. Cochrane Database of Systematic Reviews, (4).

Deluze, C., Bosia, L., Zirbs, A., Chantraine, A. and Vischer, T.L., 1992. Electroacupuncture in fibromyalgia: results of a controlled trial. British Medical Journal305(6864), pp.1249-1252.

Ezzo, J., Streitberger, K. and Schneider, A., 2006. Cochrane systematic reviews examine P6 acupuncture-point stimulation for nausea and vomiting. Journal of Alternative & Complementary Medicine12(5), pp.489-495.

Hayhoe, S., 2010. Postoperative benefits with electroacupuncture. Acupuncture in Medicine28(2), p.64.

Ho, R.T., Jawan, B., Fung, S.T., Cheung, H.K. and Lee, J.H., 1990. Electro‐acupuncture and postoperative emesis. Anaesthesia45(4), pp.327-329.

Lin, J.G., Lo, M.W., Wen, Y.R., Hsieh, C.L., Tsai, S.K. and Sun, W.Z., 2002. The effect of high and low frequency electroacupuncture in pain after lower abdominal surgery. Pain99(3), pp.509-514.

Liu, Z., Liu, Y., Xu, H., He, L., Chen, Y., Fu, L., Li, N., Lu, Y., Su, T., Sun, J. and Wang, J., 2017. Effect of electroacupuncture on urinary leakage among women with stress urinary incontinence: a randomized clinical trial. Jama317(24), pp.2493-2501.

Liu, Z., Zhou, K., Wang, Y. and Pan, Y., 2011. Electroacupuncture improves voiding function in patients with neurogenic urinary retention secondary to cauda equina injury: results from a prospective observational study. Acupuncture in Medicine29(3), pp.188-192.

Papadopoulos, D.V., Koulouvaris, P., Aggelidakis, G., Tsantes, A.G., Mavrodontidis, A. and Papadopoulos, G., 2019. Electroacupuncture for the treatment of supraspinatus calcific tendonitis. Journal of clinical orthopaedics and trauma10(3), pp.624-628.

Qu, F. and Zhou, J., 2007. Electro-acupuncture in relieving labor pain. Evidence-Based Complementary and Alternative Medicine4.

Sim, C.K., Xu, P.C., Pua, H.L., Zhang, G. and Lee, T.L., 2002. Effects of electroacupuncture on intraoperative and postoperative analgesic requirement. Acupuncture in Medicine20(2-3), pp.56-65.

Tavares, M.G., Machado, A.P., Motta, B.G., Borsatto, M.C., Rosa, A.L. and Xavier, S.P., 2007. Electro-acupuncture efficacy on pain control after mandibular third molar surgery. Brazilian Dental Journal18(2), pp.158-162.

Xu, J., Zhang, F.Q., Pei, J. and Ji, J., 2018. Acupuncture for migraine without aura: a systematic review and meta-analysis. Journal of Integrative Medicine16(5), pp.312-321.

Xue, C.C., MApplSc, L.D., Polus, B., English, R.A., Zheng, Z. and Costa, C.D., 2004. Distal point electroacupuncture for tension-type headache (n= 40). Acupuncture in Medicine22(2), pp.103-115.)

Yeung, C.K., Leung, M.C. and Chow, D.H., 2003. The use of electro-acupuncture in conjunction with exercise for the treatment of chronic low-back pain. The Journal of Alternative & Complementary Medicine, 9(4), pp.479-490.

YU, H.L. and XU, L.L., 2015. Therapeutic effect of electro-acupuncture in the treatment of Achilles tendonitis. World Journal of Acupuncture-Moxibustion25(2), pp.17-22.

Zhang, R, Lao, L; Ren, K; Berman, BM (2014) Mechanisms of Acupuncture–Electroacupuncture on Persistent Pain Anesthesiology 2014; 120:482-503

Zhang, X., Jin, H.F., Fan, Y.H., Lu, B., Meng, L.N. and Chen, J.D., 2014. Effects and mechanisms of transcutaneous electroacupuncture on chemotherapy-induced nausea and vomiting. Evidence-Based Complementary and Alternative Medicine2014.

Helen
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Robot and Human Hands

Acupuncture and AI?

New Research Paper: Here is an interesting concept for future development in acupuncture: “Artificial intelligence-directed acupuncture: a review”, in the Journal of Chinese Medicine.

How might this work? Wang (2022) and colleagues say that using computing, our ability to quantify, objectify and standardise acupuncture can be increased. Not only this, but using AI perhaps the research and outcomes from published data can be used to identify the best approaches, and even predict treatment outcomes.

It’s worth keeping in mind that from the acupuncturist’s perspective (an usually that of the patient, too), a large part of the appeal of acupuncture as a complementary medicine is that the patient is considered as an individual, and that even for the same condition, the treatment plan can vary from patient to patient as it is tailored to their need, therefore full standardisation is perhaps not the goal here, but more of a case of defining approaches and benefitting from looking at the data in novel ways.

The researchers do say that “The use of AI-based data mining has led to the discovery of hidden knowledge on acupuncture point selection and prescription.” As with any field where there is complexity, it is good to have alternative approaches and paths to choose from, and as practitioners, evidence-led there is always a combination of training and experience, alongside the updates and research insights that come through from the increasing research body.

At the moment the research is focussing on AI for common conditions that have large bodies of data and research for them, e.g. Osteoarthritis of the knee and dysmenorhhoea, and looking at particular pairs and combinations of points that arise in numerous studies.

Other uses for AI to analyse the research and effectiveness have been in the manipulation of needles, which has very many possible forms, including electroacupuncture as an adjunct.

An interesting area, which promises to deliver much insight in the coming years.

If you’d like to look into it more, a few other resources are below, including recent papers from Wang et al (2021), who predict more unified guidelines for specific TCM syndromes to come forth from AI-assisted TCM therapies in the future. Feng et al (2021) also weigh in on the ability to over come subjectivity by using AI; and Alice et al (2021) look into its application to pulse diagnosis in TCM.

References:

Feng, C., Shao, Y., Wang, B., Qu, Y., Wang, Q., Li, Y. and Yang, T., 2021. Development and application of artificial intelligence in auxiliary tcm diagnosis. Evidence-based Complementary and Alternative Medicine2021.

Feng, C., Shao, Y., Wang, B., Qu, Y., Wang, Q., Li, Y. and Yang, T., 2021. Development and application of artificial intelligence in auxiliary tcm diagnosis. Evidence-based Complementary and Alternative Medicine2021.

Wang, Y., Shi, X., Efferth, T. and Shang, D., 2022. Artificial intelligence-directed acupuncture: a review. Chinese Medicine, 17(1), pp.1-10.

Wang, Y., Shi, X., Li, L., Efferth, T. and Shang, D., 2021. The impact of artificial intelligence on traditional Chinese medicine. The American Journal of Chinese Medicine49(06), pp.1297-1314.

Helen
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Question Marks

Will acupuncture help me?

Many people ask us as acupuncturists: “What is acupuncture for?  Will it help me?”

There is not a specific list of conditions acupuncture can “treat”, but it can be used safely by the vast majority of patient groups, including during pregnancy, as there are very few contraindications. 

Our Condition Resources Pages provide links to evidence-based factsheets, based on the most commonly requested reasons for attending acupuncture.

A huge number of clinical guidelines now recommend/suggest acupuncture as an approach; most commonly for musculoskeletal, connective tissue, neurological, obstetrics & gynaecology, women’s health, oncology and gastrointestinal issues. (Zhang & al 2022a)

Acupuncture needles in a patient’s back

It is good to read around the research into the symptom or condition you’re looking to address, the factsheets, links and references here on our condition pages are a good place to start, enabling you to find and appraise the original research papers.

Pain

Acupuncture is well-known for use in pain, and is recommended in many countries’ national health services. The NHS body in charge of which treatments should be used in particular conditions recommends acupuncture for chronic pain:  The NICE Scenario Management guidelines (2021) for chronic pain state: “consider a course of acupuncture or dry needling, within a traditional Chinese or Western acupuncture system”. In America, per the US government’s National Institutes of Health: “Clinical practice guidelines issued by the American Pain Society and the American College of Physicians in 2007 recommend acupuncture as one of several nondrug approaches physicians should consider when patients with chronic low-back pain do not respond to self-care (practices that people can do by themselves, such as remaining active, applying heat, and taking pain-relieving medications).”

Popularity with the public, and uptake by insurers

Acupuncture is popular and well established. Per the WHO (2019) global report, acupuncture is widely used across the world, and in the UK, clinicians administer over 4 million acupuncture treatments each year (Zhang et al, 2022b).

Per He et al (2022) in the BMJ “Acupuncture has been incorporated into the health insurance policies of several countries. Studies have indicated that there have been many recommendations for the use of acupuncture in many clinical practice guidelines published worldwide. Both the number of guidelines recommending acupuncture and the number of acupuncture randomised controlled trials (RCTs) are increasing”

Find Out More

Shaftesbury Clinic provides a free 15 minute consultation (in person, videocall or phone call – all need to be pre-booked). This will enable you to weigh up the research, and aid in your decision about acupuncture as a possible complement to medical treatment

The British Acupuncture Council also has a number of resources for you to take a look at, including a 30-minute documentary about acupuncture

Important to know: Chronic health conditions should be addressed under direct medical supervision of your GP or consultant, and acupuncture would be an adjunct complement to usual care – it’s advisable to let your doctor know when you use this approach.

References:

He, Y., Li, J., Li, Y., Jin, R., Wen, Q., Li, N. and Zhang, Y., 2022. Strengthening the quality of clinical trials of acupuncture: a guideline protocol. BMJ open, 12(1), p.e053312. LINK: https://bmjopen.bmj.com/content/12/1/e053312 )

NICE (2021) Chronic pain: Scenario: Management Last revised in April 2021

NIH (2022) https://www.nccih.nih.gov/health/acupuncture-in-depth.

Zhang, Y.Q., Lu, L., Xu, N., Tang, X., Shi, X., Carrasco-Labra, A., Schünemann, H., Chen, Y., Xia, J., Chen, G. and Liu, J., 2022a. Increasing the usefulness of acupuncture guideline recommendations. bmj376. https://bmj.com/content/376/bmj-2022-070533.full

Zhang, Y.Q., Jing, X. and Guyatt, G., 2022b. Improving acupuncture research: progress, guidance, and future directions. BMJ, 376. https://www.bmj.com/content/376/bmj.o487

Helen
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New Research : Acupuncture Tapping in Psychotherapy

A new research article looks at acupuncture points and psychotherapy in practise. The interesting new article in the Journal of Psychotherapy Integration, discusses the use of acupuncture points within psychotherapy (the reference, and links to original article are below).

A holistic approach is increasingly being understood to include more that one modality to increase how effective an approach can be. This is well known for crossing the borders between, say mainstream medicine in areas like pain, but possible less so in the sphere of mental health, despite the fat that acupuncture and TCM (Traditional Chinese Medicine) have long included protocols for health on all levels of mind and body.

Traditional acupuncture uses needle stimulation on a network of specific points, tailored to the patient and presenting condition. In addition to, or instead of needles, acupuncturists can also use heat or acupressure (needle-less stimulation of points).

Tapping of a specific set of points in a protocol, is a fairly ew approach to self-care when experiencing anxiety or pain symptoms, for example. This can be done when the patient has been trained on how to do this, and increasingly this has been adopted in other settings. Today, other techniques incorporate some of the benefits of acupuncture alongside talking therapies, and there is a decent and growing research body here.

Per this research article Feinstein (2022 – ref and link below) the research and use of this are coming to the fore; there are “28 systematic reviews and meta-analyses, 125 clinical trials, 24 case studies, 26 reports describing systematic observations, 17 mixed-method clinical trials that included a tapping component, and 88 articles addressing clinical procedures, theory, mechanisms, or related issues” (Feinstein, 2022).

Sometimes called Emotional Freedom Technique (EFT), this shows the way in which cross-modality approaches can be applicable to real life cases. The acupuncture component of this has indeed been shown to be an active part of EFT (Church et al, 2018).

The overall outcome from looking at the state of research into the integration into psychotherapy of using tapping of acupuncture points is promising, and that the growing evidence base documents the effectiveness, speed, and durability of the approach.

References:

Church, D., Stapleton, P., Yang, A. and Gallo, F., 2018. Is tapping on acupuncture points an active ingredient in Emotional Freedom Techniques? A systematic review and meta-analysis of comparative studies. The Journal of nervous and mental disease206(10), pp.783-793.

Feinstein, D., 2022. Integrating the manual stimulation of acupuncture points into psychotherapy: A systematic review with clinical recommendations. Journal of Psychotherapy Integration. https://psycnet.apa.org/record/2022-61876-001

Helen
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Gillie

An interview with Gillie Salter, Acupuncturist at Shaftesbury Clinic

Gillie Salter joined the team at Shaftesbury Clinic in March 2022.   Helen caught up with her for a chat to find out what brought her to acupuncture; the types of clients she works with; and what inspires her in her work…

Fact File:

    • ☼  Gillie graduated from the Acupuncture Academy (Leamington Spa) in December 2020 after 3 years’ degree level training, with a distinction in the Professional Licentiate in Acupuncture
    • ☼  She is a member of the British Acupuncture Council (BAcC), the UK’s leading Regulatory Body for traditional acupuncture, and the largest, with over 2,500 members.
    • ☼  BAcC members must have at least 3,600 hours’ degree-level training; 400 or more of which in a clinical setting
    • ☼  The BACC is regulated by the Professional Standards Authority (PSA), which is accountable to the UK Parliament

Helen:  What was your work background before acupuncture?

Gillie:  My background is in nursing, having worked as a district nurse, where I really enjoyed the work, in particular meeting and looking after people from all different backgrounds.  Later on, I studied further, gaining a Masters degree in Medical Anthropology.

Helen:  For people who haven’t come cross it before, can you tell us a bit more about medical anthropology?

Gillie:  Anthropology in general looks at what makes us human, how people live, and is a holistic approach, with medical anthropology specifically looking at how the practise of medicine, and health and wellbeing are understood and approached in different cultures and settings. For my dissertation, I used Ethnography, which is a systematic way to study cultural phenomena, within an elderly day care setting.

Acupuncture Pulse Taking

Helen:  What led you from nursing and medical anthropology, toward acupuncture?

GIllie:  After having my two children, the logistics of going back into nursing just weren’t practical, so I took on other roles including as a teaching assistant, and volunteer work, before combining my experience and interest to study acupuncture.  I had looked into acupuncture and became certain that it was for me, after attending an open day at the TAA college in Leamington Spa, which inspired and impressed me.

Helen:  What do you value about acupuncture that sets it apart from other approaches?

Gillie:  It is the cultural aspect of the TCM (Traditional Chinese Medicine) approach that appeals to me, looking at the whole person within the treatment approach, in contrast to the Biomedicine (Western, allopathic) approach which works from viewing the mind and the body as being separate from each other.

Helen:  Do you have any special interests within acupuncture practise, or patient groups that you work with specifically?

Gillie:  I enjoy all aspects of the variety that comes my way, as acupuncture can contribute so much to many different people, for their concerns and conditions.  I treat all ages, including children.

Acupuncture needle in situHelen:  How can someone interested in acupuncture find out more, and book in with you?

Gillie:  Myself, and the other acupuncturists at Shaftesbury Clinic, offer a free 15 minute phone call, video chat or in-person consultation for a prospective patient to speak to one of us, and ask any questions they have about acupuncture.

This way, they can be given the information they need, and a realistic appraisal of what we can offer, so they can decide whether this is the approach for them.

There are a few ways to book:  There’s a link here on the website to book in for a 15 minute chat, or for a treatment; alternatively they could ring the clinic direct to book on 01234 511522; or send the clinic an email, or contact form from the website.

Helen: Finally, when are you available to see patients in Bedford, Gillie?

Gillie:  I work Mondays at Shaftesbury Clinic (based at Bedford Consulting Rooms).  My colleague Phil Rose-Neil works Tuesdays, Thursdays and Saturdays; Louise England on Tuesdays, and Darren Haines on Wednesday evenings and Fridays.

Helen:  Thank you for talking to me about your work today, Gillie!

Helen
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Acupuncture needle in situ

Battlefield Acupuncture

Important to know: Chronic health conditions should be addressed under direct medical supervision of your GP or consultant, and acupuncture would be an adjunct or complement to usual care – we advise that you let you doctor know when you use this approach.

Battlefield acupuncture was developed with the intention to be used in military battlefields as well as in emergency situations, as a protocol for the rapid relief of pain. Consisting of a set of auricular acupuncture points (on the ear), the technique is tailored to the type and location of the pain, making it potentially applicable to many types of pain. 

Case Study and Video for Trauma/PTSD

Acupuncturists (MBAcC) Rachel Peckham and Samina Haider set up an acupuncture NADA group in a Mosque in London in the aftermath of the Grenfell Tower tragedy, using the NADA protocol for trauma application, there is a video about this from the British Acupuncture Council here that may be of interest, and which shows the NADA protocol in action, and patients talking about it and their experiences of it: BAcC auricular (NADA) video Rachel talks about the general uses of this, background and the idea which came from the use of this in the aftermath of 9/11 in America.

Research and Resources on Battlefield Acupuncture:

A scholarly search of the available research papers on the terms “acupuncture” + “battlefield” yields over 3150 papers, and narrowing this to “RCT” to identify Randomised Controlled Trials, gives over 139 results; of which 48% have been carried out since 2017 (Google Scholar). This suggests that acupuncture is being used currently in this area, leading to a small body of research being carried out so far (it is a recent development and area of practise). However the pace of research is increasing with nearly 50% of the research ever done, having happened in the last 4 years, showing promise for future studies and systematic reviews regarding examining its potential role.

Interpreting the research:

When reading health research, it is important to know that Systematic Reviews or Meta Analyses of a large number of high-quality research studies are the very best way to be able to say to what extent a given treatment can address a condition, symptom, or set of symptoms.  The next best level of evidence is the individual Randomised Controlled Study (RCT) which uses a systematic technique to compare two or more groups of patients receiving different treatments (or a treatment against a “control”, or no treatment).  In acupuncture trials, the nature of the control group is of particular interest as it is hard to blind a patient to whether they are having a needle inserted or not, and even more challenging to blind the researcher/team to this.

The means and quality of how research is carried out varies considerably from country to country, and in terms of how an intervention is compared to another intervention (or a control).  Of note is the fact that “sham” acupuncture (where needles are placed in apparently inert locations rather than traditional acupuncture points) is not really an inert process as it has physiological effects, so that comparing sham and “true acupuncture” may therefore not give a clear picture alone; but and form a part of a research body where acupuncture versus no treatment, vs conventional treatment or vs a different approach/modality also form part of the evidence base.

The n= figure (where quoted in research) tells you how many people were participants in the study, and usually the larger a study (when it is of good quality and design), the more likely it is to be reliable and applicable to larger populations. When (statistical) “significance” is discussed in view of studies it has a very particular meaning – it is the confidence in the data (using statistical tests) that tells us how likely a result could have just come about by chance. The lower the possibility of a chance result, the more likely it is due to the intervention in the experiment. When you are reading a trial/study, the “p” is the number telling us of significance, and this must be under 5% (or p less than 0.05) to mean we can say it is a (statistically) “significant” result.

The Research:

A 2017 systematic review of 6 trials (Jan et al, 2017; n=458) found that “ear acupuncture, either as stand-alone or as-an-adjunct technique, significantly reduced pain scores and has potential benefits for use in the ED [emergency department]”, although study numbers were limited at the time more research had since been carried out, so we look forward to more sysyematic reviews as this develops..

This style of acupuncture has been found effective as an adjunct for low back pain in a USA ED setting (Emergency Dept., A&E equivalent, with a statistically significant benefit over usual care alone (Fox et al, 2018; n=30; p=0.04). Tsai et al, (2016) described 4 cases in which emergency physicians with brief training in the protocol treated patients with acute pain when opioid-based painkillers were unsuitable. It has also been examined in the case of chronic neck pain (Guthrie et al, 2016).

Elsewhere, battlefield acupuncture is used the US Department of Defense’s medical facilities for ex-military personnel for trauma related issues including PTSD (Walker et al, 2016);

Recently, a systematic review protocol was put forward (Zhang et al, 2020) for application of battlefield acupuncture protocol to migraine; it will be interesting to see the outcome here.

Regarding Your Individual Condition and Symptoms:

There are many painful conditions for which patients seek out acupuncture to address their symptoms. We have dedicated pages for arthritis, back pain, carpal tunnel, facial (TMJ) pain, shoulder and frozen shoulder, headache, migraine, kidney stones, plantar fasciitis, knee pain, sciatica, neuropathic (nerve) pain, rheumatoid arthritis, tennis and golfer’s elbow, neck pain, and pelvic pain each of which give references and further resources to evidence based factsheets and may be of use.

Whilst the scientific studies are of great interest to researchers and acupuncturists in terms of comparing protocols, for the patient not versed in research they are less accessible, which is why when we asked “can acupuncture work for my (condition or symptom) we are not able to give a simple yes or no response.  We are able to tell you what experience we have had in our decades of experience in practise, of the types of outcomes we have seen in similar cases, and give you an idea of our level of experience and knowledge in that area, and how this could relate to your own individual situation.  For this, we recommend booking a free telephone consultation where we can answer any questions you have and give a realistic appraisal of what acupuncture may be able to provide.

References:

Fox, L.M., Murakami, M., Danesh, H. and Manini, A.F., 2018. Battlefield acupuncture to treat low back pain in the emergency department. The American Journal of Emergency Medicine, 36(6), pp.1045-1048.

Guthrie, R.M. and Chorba, R., 2016. Physical Therapy Treatment Of Chronic Neck Pain A Discussion And Case Study: Using Dry Needling And Battlefield Acupuncture. Journal of special operations medicine: a peer reviewed journal for SOF medical professionals, 16(1), pp.1-5.

Jan, A.L., Aldridge, E.S., Rogers, I.R., Visser, E.J., Bulsara, M.K. and Niemtzow, R.C., 2017. Does ear acupuncture have a role for pain relief in the emergency setting? A systematic review and meta-analysis. Medical acupuncture29(5), pp.276-289.

Niemtzow, R.C., 2007. Battlefield acupuncture. Medical Acupuncture, 19(4), pp.225-228.

Tsai, S.L., Fox, L.M., Murakami, M. and Tsung, J.W., 2016. Auricular acupuncture in emergency department treatment of acute pain. Annals of emergency medicine, 68(5), pp.583-585.

Walker, P.H., Pock, A., Ling, C.G., Kwon, K.N. and Vaughan, M., 2016. Battlefield acupuncture: opening the door for acupuncture in Department of Defense/Veteran’s Administration health care. Nursing outlook, 64(5), pp.491-498.

Zhang, F., Shen, Y., Fu, H., Zhou, H. and Wang, C., 2020. Auricular acupuncture for migraine: a systematic review protocol. Medicine99(5).

Resources:

BAcC Acupuncture for PTSD Factsheet

Helen
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Acupuncture for pregnancy in Bedford, UK

Pregnancy, Breech baby, and Childbirth – Condition Resources

Important to know: Chronic health conditions should be addressed under direct medical supervision of your GP or consultant, and acupuncture would be an adjunct or complement to usual care – we advise that you let you doctor know when you use this approach.

Acupuncture is a safe and popular choice during pregnancy, our practitioners have worked with very many pregnant women at all stages of pregnancy over the years. It is important that your midwife/obstetrician is happy with this approach, and we have had many direct recommendations to us, from local midwives over the years.

There is an interesting video from the British Acupuncture Council with a patient regarding hyperemesis gravidarum (severe morning sickness) and her use of acupuncture, showing a treatment and discussion with her acupuncturist: you can see it here

The BAcC has a factsheet on the research and use of acupuncture in Obstetrics, as well as one on Childbirth, and on Puerperium (post natal period) 

Acupuncture is safe in pregnancy with a qualified acupuncturist.

Research and Resources on Pregnancy and Acupuncture:

A scholarly search of the available research studies mentioning “acupuncture and pregnancy” reveals over 45,00 papers from journals, of these “RCT” narrows down to 5,280 papers. Of the RCT’s ever published in this area, 38% have been published in the last 4 years (since 2017). A number of systematic reviews have been done for acupuncture in particular issues of pregnancy (see below).  From this abundance of research, we can deduce that acupuncture is employed, traditionally and currently in this area; widely scientifically researched, and that the pace at which the research is being carried is increasing – leading us to understand this is an area that has been deemed worthy of scientific appraisal and consideration.  

Interpreting the research:

When reading health research, it is important to know that Systematic Reviews or Meta Analyses of a large number of high-quality research studies are the very best way to be able to say to what extent a given treatment can address a condition, symptom, or set of symptoms.  The next best level of evidence is the individual Randomised Controlled Study (RCT) which uses a systematic technique to compare two or more groups of patients receiving different treatments (or a treatment against a “control”, or no treatment).  In acupuncture trials, the nature of the control group is of particular interest as it is hard to blind a patient to whether they are having a needle inserted or not, and even more challenging to blind the researcher/team to this.

The means and quality of how research is carried out varies considerably from country to country, and in terms of how an intervention is compared to another intervention (or a control).  Of note is the fact that “sham” acupuncture (where needles are placed in apparently inert locations rather than traditional acupuncture points) is not really an inert process as it has physiological effects, so that comparing sham and “true acupuncture” may therefore not give a clear picture alone; but and form a part of a research body where acupuncture versus no treatment, vs conventional treatment or vs a different approach/modality also form part of the evidence base.

The n= figure (where quoted in research) tells you how many people were participants in the study, and usually the larger a study (when it is of good quality and design), the more likely it is to be reliable and applicable to larger populations. When (statistical) “significance” is discussed in view of studies it has a very particular meaning – it is the confidence in the data (using statistical tests) that tells us how likely a result could have just come about by chance. The lower the possibility of a chance result, the more likely it is due to the intervention in the experiment. When you are reading a trial/study, the “p” is the number telling us of significance, and this must be under 5% (or p less than 0.05) to mean we can say it is a (statistically) “significant” result.

Breech Presentation

A common request and referral from midwives is regarding the use of moxibustion to the point Bl67, which is a traditional indication for the Breech presentation of a baby. There have been over 600 number of scientific papers in this area as seen in a scholarly search, and a number of systematic reviews in a scholarly search, showing this as an area of frequent use, as well as scientific interest. Systematic reviews that have been carried out on this are: Liao et al, (2021); Vas et al, (2009); Li et al, (2009); Van den Berg et al, (2008); Mailan et al (2009); Lee at al, (2010); Zhang et al, (2013). Full references are below, to enable to you find and access the original articles.

The most recent of these systematic reviews, carried out by Taiwanese researchers (Liao et al, 2021) looked at 16 RCT’s and n=2555, appraised the studies in terms of bias risk as well as outcome, excluding studies that were not of sufficient quality, 8 studies from China were included, and the rest from European countries. Overall they found that moxibustion had merit in this field, but that more RCT’s are needed to establish the magnitude of the effect. A systematic review found moxibustion as used in this field to be safe when carried out by a trained professional (Xu et al, 2014;

It is vital that your obstetrician and midwife are aware before you undertake acupuncture (or any complementary therapy) in pregnancy.

Induction of Labour

This is an area for which pregnant women sometimes look to information about acupuncture when they are overdue their expected deliver date, usually because they have heard mention of it from a midwife, or had a personal recommendation for someone they know.

It is vital that your obstetrician and midwife are aware before you undertake acupuncture (or any complementary therapy) in pregnancy.

Studies have been done regarding traditional acupuncture protocols for this, (a scholarly search reveals over 930 articles mentioning “acupuncture” + “labour induction” OR “labor induction”, 30% of these have been carried out since 2017.

A Cochrane systematic review of 22 trials (Smith et al, 2017), concluded that acupuncture showed some benefit in improving cervical maturity, but insufficient evidence as to whether it reduced caesarean rate, meaning more high-quality RCT trials are needed. In a more recent systematic review, Siregar et al (2020, 9 articles, n=1656) reached a similar conclusion.

Hyperemesis Gravidarum (Morning Sickness)

Studies have been done regarding traditional acupuncture protocols for this, (a scholarly search reveals over 2,200 articles mentioning “acupuncture” + “hyperemesis gravidarum”, 207 show as “RCT” and 24% of these have been carried out since 2017.

In 1996, researcher Andrew Vickers had published a review article entitled “Can Acupuncture have Specific Effects on Health? A Systematic Review of Acupuncture Antiemesis Trials” (Vickers, 1996), because the traditional anti-sickness point in acupuncture theory was PC6, he examined 33 trials of the effect of this in nausea caused by pregnancy as well as chemotherapy and post-surgery, with the research pointing to PC6 having an anti nausea effect. Of interest to note is that the car sickness wristbands that have been available to buy in chemists for a couple of decades, are intended to press upon this exact acupuncture /acupressure points, their idea being drawn from traditional acupuncture.

Systematic reviews in this area include Sridharan and Sivaramakrishnan (2020; 20 studies) which saw some benefit for the acupuncture intervention, albeit that the quality of the studies was low and warranted more trials in future; Van den Heuvel et al ‘s systematic review (2015, 29 trials, n=3519) had reached a similar conclusion. Li et al, 2017 (11 studies) also concurred, noting in addition the possible publication bias (i.e. researchers having carried out a successful study may be more likely to publish it/have it accepted for publication than are those whose study shows no effects in some spheres).

EA is a safe and effective form of therapy and was found effective for hyperemesis gravidarum (severe “morning sickness” of pregnancy) (Ezzo et al, 2006). Yan et al recently (2020) put forward a protocol for a systematic review in this area, so this is currently awaited.

Mechanism of action in nausea and vomiting: an animal model: Scallan et al (2016) investigated point PC6 on 81 healthy dogs who had drug-induces nausea and vomiting, finding that use of the point reduces vomiting. Notably in animals the placebo effect is somewhat overcome by a lack of the animal anticipating an acupuncture intervention to be of assistance.

Dyspepsia (Indigestion, Heartburn)

We have a separate page for this condition – Dyspepsia – which is common in pregnancy

Low Back Pain

We have a separate page for this condition – Low Back Pain – which is common in pregnancy

Post Caesarean Pain

We have a separate page for this condition – Post Operative Pain – which is common in pregnancy

Mental Health, Anxiety, Depression

We have separate pages for these conditions – AnxietyDepressionMental HealthStress and a blog about mental health

Gestational Diabetes

The British Acupuncture’s Diabetes Factsheet also covers the research that has been done into Gestational Diabetes.

Regarding Your Individual Condition and Symptoms:

Whilst the scientific studies are of great interest to researchers and acupuncturists in terms of comparing protocols, for the patient not versed in research they are less accessible, which is why when we asked “can acupuncture work for my (condition or symptom) we are not able to give a simple yes or no response.  We are able to tell you what experience we have had in our decades of experience in practise, of the types of outcomes we have seen in similar cases, and give you an idea of our level of experience and knowledge in that area, and how this could relate to your own individual situation.  For this, we recommend booking a free telephone consultation where we can answer any questions you have and give a realistic appraisal of what acupuncture may be able to provide.

See our Fertility and Pregnancy page for full details on the studies and mechanisms of the above.

Resources:

The British Acupuncture Council has several relevant evidence based factsheets about Women’s Health, including specific research, trials and mechanisms of action for acupuncture in these conditions.

BAcC Childbirth and acupuncture factsheet

BAcC Obstetrics (pregnancy and childbirth) and acupuncture factsheet

BAcC Puerperium (postnatal / postpartum) acupuncture factsheet

Our own page on Fertility, Pregnancy and Acupuncture

The British Acupuncture Council also has a review paper on Gynaecology and acupuncture: The evidence for effectiveness

Bibliography:

Ezzo, J., Streitberger, K. and Schneider, A., 2006. Cochrane systematic reviews examine P6 acupuncture-point stimulation for nausea and vomiting. Journal of Alternative & Complementary Medicine12(5), pp.489-495.

Khorram, N.M.; S. Horton, V. Sahakian The Effect of Acupuncture on Outcome of in Vitro Fertilization Fertility and Sterility, Vol. 84, S364 Published in issue: September 2005

Li, Xun, Jun Hu, Xiaoyi Wang, Huirui Zhang, and Jianping Liu. Moxibustion and other acupuncture point stimulation methods to treat breech presentation: a systematic review of clinical trials. Chin Med 2009;4:4.

LI, Y., WANG, Y., LI, C. and ZHANG, Z., 2017. A Systematic Review and Meta-analysis of Domestic Acupuncture for Treatment of Hyperemesis Gravidarum. Journal of Liaoning University of Traditional Chinese Medicine, p.09.

Lee, M.S., Kang, J.W. and Ernst, E., 2010. Does moxibustion work? An overview of systematic reviews. BMC Research Notes3(1), pp.1-5.

Liao, J.A., Shao, S.C., Chang, C.T., Chai, P.Y.C., Owang, K.L., Huang, T.H., Yang, C.H., Lee, T.J. and Chen, Y.C., 2021, June. Correction of Breech Presentation with Moxibustion and Acupuncture: A Systematic Review and Meta-Analysis. In Healthcare (Vol. 9, No. 6, p. 619). Multidisciplinary Digital Publishing Institute.

Lim, Chi Eung Danforn; Jenny Wilkinson, WS Felix Wong, Nga Chong Lisa Cheng Effect of Acupuncture on Induction of Labor Journal of alternative and complementary medicine (New York, N.Y.)  11/2009; 15(11):1209-14.

Mailan, L.I.U., Lei, L.A.N., Yong, T.A.N.G. and Fanrong, L.I.A.N.G., 2009. Acupuncture and moxibustion for breech presentation: a systematic review. Chinese Journal of Evidence-Based Medicine9(8), pp.840-843.

Manber, Rachel PhD; Schnyer, Rosa N. DAOM, LAc; Lyell, Deirdre MD; Chambers, Andrea S. PhD; Caughey, Aaron B. MD, PhD; Druzin, Maurice MD; Carlyle, Erin MS; Celio, Christine MS; Gress, Jenna L. BA; Huang, Mary I. MS; Kalista, Tasha MA; Martin-Okada, Robin BS; Allen, John J. B. PhD Acupuncture for depression during pregnancy: a randomized controlled trial. ObstetGynecol 2010;115:511-20

Mozurkewich, E.L., Chilimigras, J.L., Berman, D.R., Perni, U.C., Romero, V.C., King, V.J. and Keeton, K.L., 2011. Methods of induction of labour: a systematic review. BMC pregnancy and childbirth11(1), pp.1-19.

Scallan, E.M. and Simon, B.T., 2016. The effects of acupuncture point Pericardium 6 on hydromorphone-induced nausea and vomiting in healthy dogs. Veterinary anaesthesia and analgesia43(5), pp.495-501.

Siregar, E., Herawati, L., Runjati, R. and Erisna, M., 2020. The Effects of Acupressure and Acupuncture as Natural Induction Methods for Spontaneous Labor: A Systematic Review. International Journal of Nursing and Health Services (IJNHS)3(6), pp.743-753.

Smith, C; Crowther, C and Beilby, J (2002) Acupuncture To Treat Nausea and Vomiting in Early Pregnancy: A Randomized Controlled Trial Birth Volume 29 Issue 1, Pages 1-9

Smith, C.A., Armour, M. and Dahlen, H.G., 2017. Acupuncture or acupressure for induction of labour. Cochrane Database of Systematic Reviews, (10).

Sridharan, K. and Sivaramakrishnan, G., 2020. Interventions for treating hyperemesis gravidarum: a network meta-analysis of randomized clinical trials. The Journal of Maternal-Fetal & Neonatal Medicine33(8), pp.1405-1411.

van den Berg I, Bosch JL, Jacobs B, Bouman I, Duvekot JJ, Hunink MG. Effectiveness of acupuncture-type interventions versus expectant management to correct breech presentation: a systematic review. Complement Ther Med 2008;16:92-100.) 

Van den Heuvel, E., Goossens, M., Vanderhaegen, H., Sun, H.X. and Buntinx, F., 2015. Effect of acustimulation on nausea and vomiting and on hyperemesis in pregnancy: a systematic review of Western and Chinese literature. BMC complementary and alternative medicine16(1), pp.1-18.

Vas J, Aranda JM, Nishishinya B, Mendez C, Martin MA, Pons J, Liu JP, Wang CY, Perea-Milla E. Correction of nonvertex presentation with moxibustion: a systematic review and metaanalysis. Am J Obstet Gynecol.2009 Sep;201(3):241-59.

Vickers, A.J., 1996. Can acupuncture have specific effects on health? A systematic review of acupuncture antiemesis trials. Journal of the Royal Society of Medicine89(6), pp.303-311.

Xu, Jin; MacKenzie, Ian Z.The current use of acupuncture during pregnancy and childbirth Current Opinion in Obstetrics &Gynecology. 24(2):65-71, March 2012. 

Xu, J., Deng, H. and Shen, X., 2014. Safety of moxibustion: a systematic review of case reports. Evidence-Based Complementary and Alternative Medicine2014.

Yan, R., Zhan, J., Liu, G., Li, C., Cai, P., Chen, Y. and Cao, H., 2020. A comparison of the efficacy and safety of traditional Chinese medicine external treatment for the hyperemesis gravidarum: A protocol for systematic review and network meta-analysis. Medicine99(45).

Zhang, Q.H., Yue, J.H., Liu, M., Sun, Z.R., Sun, Q., Han, C. and Wang, D., 2013. Moxibustion for the correction of nonvertex presentation: a systematic review and meta-analysis of randomized controlled trials. Evidence-Based Complementary and Alternative Medicine2013.

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Arthritis – Condition Resources

Important to know: Chronic health conditions should be addressed under direct medical supervision of your GP or consultant, and acupuncture would be an adjunct or complement to usual care – we advise that you let you doctor know when you use this approach.

Acupuncture has been shown to modulate inflammatory responses in the body, as well as to reduce the activity in the areas of the brain associated with pain and stress (as seen on functional MRI brain scans in research settings).

Interpreting the research:

When reading health research, it is important to know that Systematic Reviews or Meta Analyses of a large number of high-quality research studies are the very best way to be able to say to what extent a given treatment can address a condition, symptom, or set of symptoms.  The next best level of evidence is the individual Randomised Controlled Study (RCT) which uses a systematic technique to compare two or more groups of patients receiving different treatments (or a treatment against a “control”, or no treatment).  In acupuncture trials, the nature of the control group is of particular interest as it is hard to blind a patient to whether they are having a needle inserted or not, and even more challenging to blind the researcher/team to this.

The means and quality of how research is carried out varies considerably from country to country, and in terms of how an intervention is compared to another intervention (or a control).  Of note is the fact that “sham” acupuncture (where needles are placed in apparently inert locations rather than traditional acupuncture points) is not really an inert process as it has physiological effects, so that comparing sham and “true acupuncture” may therefore not give a clear picture alone; but and form a part of a research body where acupuncture versus no treatment, vs conventional treatment or vs a different approach/modality also form part of the evidence base.

The n= figure (where quoted in research) tells you how many people were participants in the study, and usually the larger a study (when it is of good quality and design), the more likely it is to be reliable and applicable to larger populations. When (statistical) “significance” is discussed in view of studies it has a very particular meaning – it is the confidence in the data (using statistical tests) that tells us how likely a result could have just come about by chance. The lower the possibility of a chance result, the more likely it is due to the intervention in the experiment. When you are reading a trial/study, the “p” is the number telling us of significance, and this must be under 5% (or p less than 0.05) to mean we can say it is a (statistically) “significant” result.

The research:

Osteoarthritis: Since 2005, there have been over than 50 NHS publications recommending acupuncture for osteoarthritis (largely knee or hip) and many more worldwide (Birch et al 2018).

A large (n=20827) meta-analysis of 39 studies showed acupuncture to be significantly superior to usual care and to sham (non-specific acupuncture point usage), for patients with osteoarthritis and other painful conditions (all p <.001; Vickers et al, 2018).  Additionally, clear evidence was found in this meta-study that that the effects of acupuncture persisted over time.

For patients with osteoarthritis pain, acupuncture improved pain relief compared to sham at short-term and at six-month follow up. When compared to wait list controls, acupuncture showed a clinically significant improvement in short term pain relief.  A randomised controlled trail in patients with osteoarthritis of the knee or hip, showed a significant difference at three months between acupuncture and routine care (Reinhold et al, 2008; Manheimer et al, 2010).

Knee Pain: Osteoarthritis of the knee is a chronic degenerative disease, with symptoms of pain, stiffness, swelling and dysfunction.  OA of the knee is the most prevalent pain- and disability inducing condition in adults over 50 years old (Araya-Quintanilla et al. 2022)

A systematic review and meta-analysis of 17 trials, showed significant benefits whereby in patients in study groups having received acupuncture, this was associated with significantly reduced chronic knee pain 12 weeks (Zhang et al, 2017).  Specifically comparing treatments including acupuncture in osteoarthritic knee pain, Corbett et al’s (2013, n=9709) systematic review and network meta-analysis found that acupuncture could be considered as one of the more effective physical treatments for alleviating osteoarthritis knee pain in the short-term: Acupuncture was ranked second out of 21 physical treatments in this study.  The team also clarified that further research is also warranted in this area, due to the quality of the research available in some treatment areas across the studies.

Acupuncture can be cost effective, according to an RCT (n=60); acupuncture was offered to patients with knee osteoarthritis who were going to be referred for orthopaedic surgery by their GP, with acupuncture a third were able to avoid surgery which also represented a cost-saving of £100,000 per year [to the NHS]” (White et al, 2016). Acupuncture has been found to improve improve pain and improve function and quality of life in knee osteoarthritis, particularly where chronic (Tian et al, 2022).

An overview of 15 systematic reviews of pain relief in patients with osteoarthritis knee by Araya-Quintanilla et al. (2022) found that in the short term, acupuncture had a moderate positive impact on both pain intensity; and knee function, compared to the control groups. The evidence was rated as low to very low quality according to GRADE ratings.

The systematic review of eleven RCTs with meta-analysis by Tian et al. (2021) found that acupuncture had a positive effect on reducing pain and improving functional activities in patients with knee osteoarthritis. However, there was no significant effect on relieving stiffness or improving the quality of life (mental or physical health) compared to sham acupuncture. The findings suggest that acupuncture can be recommended as a beneficial alternative therapy for patients with chronic pain and knee OA, but further studies are needed to verify the effectiveness in function improvement.

Liu, J., et al, 2022; In this multicentre RCT (n=625), patients were randomly assigned to receive acupuncture at acupoints with Lower Pain Threshold (LPT); acupuncture at acupoints with Higher Pain Threshold (HPT); and no acupuncture (waiting-list group).  Measures of pain and symptoms (WOMAC) from baseline to 16 weeks; outcome measures of daily life impact of condition (SF-12 score); and active knee range of motion (ROM) were used as comparators. From baseline to 16 weeks, the effects of acupuncture at acupoints with lower versus higher PT were similar, as both were effective for patients with OA of the knee, “results confirmed the positive effects of acupuncture on pain, stiffness, physical function and quality of life of in patients” compared to the waiting list group.

A further systematic review and meta-analysis is due as per the recent protocol in the BMJ (Lui, C.Y., et al; 2022).

Hip osteoarthritis: There is less research in this area, although it is growing, a systematic review (Manheimer et al, 2018; n=413, for 6 trials) found Acupuncture beneficial as an add-on to usual GP care, with a small but significant benefit for physical quality of life.

Mechanisms of Action:

A review article (Kavoussi & Ross, 2007) suggests that the anti-inflammatory actions that have been demonstrated to be brought about by acupuncture may be mediated via activation of the vagus nerve, alongside deactivation of inflammatory macrophages and other proinflammatory cytokines.  The researchers concluded that “The use of acupuncture as an adjunct therapy to conventional medical treatment for a number of chronic inflammatory and autoimmune diseases seems plausible and should be validated by confirming its cholinergicity”.  Other studies (Zijlstra et al, 2003) have revealed that acupuncture some of the pain modulating and anti-inflammatory effects exhibited in acupuncture may be due to the fact that it has been shown to stimulate certain substances in the body which act as vasodilators, neurotransmitters and painkillers (beta-endorphins, CGRP and substance P) and further stimulate cytokines and nitric oxide, all of which play roles in inflammatory states. 

Zijlstra et al (2003) reviewed the effects and mechanisms of acupuncture in treating various inflammatory diseases and conditions. They proposed the mechanisms of action:

✳️ Acupuncture may release neuropeptides from nerve endings that have vasodilative and anti-inflammatory effects through CGRP.

✳️ Acupuncture may also interact with substance P, which is involved in pain transmission and inflammation.

✳️ Acupuncture may contribute to analgesia by stimulating the release of β-endorphin, which binds to opioid receptors and inhibits pain signals.

✳️ Acupuncture may influence the balance between cell-specific pro-inflammatory and anti-inflammatory cytokines such as TNF-α and IL-10.

CSR and ERP are blood tests related to the functioning of the immune system, that can measure and monitor inflammation in the body.  They are relevant to conditions such as Rheumatoid Arthritis, and other immune and inflammatory conditions. Per a review by Feng at al, (2023) electroacupuncture (EA) plus medication had a significant effect in lowering both ESR and CRP levels in patients with RA compared with medication alone.  These results suggest that EA may have an anti-inflammatory effect and improve the immune status of patients with RA.

Liu et al (2014) investigated the anti-inflammatory effect of electroacupuncture (EA) in a rat tissue chamber model of inflammation. The study found that EA inhibited the p65 protein from moving to the cell nucleus to activate inflammatory genes.  EA also increased the expression of IκBα, which binds to NF-κB and preventing it from entering the nucleus to activate inflammatory genes. These interfere with the IκB/NF-κB pathway that regulates inflammation, indicating one of the mechanisms of acupuncture in modulating immune / inflammatory response.

Acupuncture stimulates the body to create its own natural painkilling substances, such as Beta Endorphins (β-Endorphin). In studies acupuncture has been shown to stimulate the production of natural painkillers called opioid-like peptides (OLPs), including β-Endorphin: For example, this was shown in an RCT in 90 patients with a range of painful disorders (Petti et al, 1998). The same study showed acupuncture also and enhanced the activity of immune cells (lymphocytes, natural killer cells and monocytes) that help fight infections and diseases (Petti et al, 1998).

Acupuncture can activate mast cells at acupoints, which release histamine, serotonin, adenosine, and other mediators that modulate nerve transmission and inflammation (Li et al, 2022)

Wang et al (2023) reviewed evidence from animal and human studies regarding the immunomodulatory mechanism of acupuncture, regarding its effects on different components of the immune system, such as mast cells, macrophages, neutrophils, natural killer cells, astrocytes, microglia, CD4+ and CD8+ T cells, and cytokines.  They detailed the neuroanatomical mechanisms of acupuncture in immunomodulation, such as the vagal-adrenal pathway, the cholinergic anti-inflammatory pathway, the spinal sympathetic pathway, the brain-gut axis, and the hypothalamus-pituitary-adrenal axis.  They concluded that studies to support the role of acupuncture in regulating inflammation, infection, allergy, pain, and tissue repair.

Per MacDonald et al (2015), acupuncture may:

  • modulate immune function by altering the balance of Th1 and Th2 cells and suppressing mast cell degranulation
  • influence various receptors and signalling pathways that are involved in inflammatory response, such as TRPV1, opioid, chemokine, dopamine, and cannabinoid receptors
  • activate a novel cholinergic anti-inflammatory pathway that involves vagal and sciatic nerves and is mediated by dopamine
  • reduce inflammation by downregulating proinflammatory neuropeptides, cytokines, and neurotrophins

Animal Models

Many mechanisms of action have been investigated in animal models as well as in humans to measure brain activity associated with pain and the levels of biomarkers associated with inflammation.

Animal models: A systematic review and meta-analysis of 21 animal studies (Yu et al, 2023) investigated acupuncture’s effect on pain and swelling of arthritis animal models. Acupuncture was found to increase tolerance to pain stimuli and reduce swelling in arthritis animals, the researchers suggested possible mechanisms of action as being via nervous and immune system regulation.

An animal model study (Sun et al, 2023; n=36) investigated the effects of electroacupuncture (EA) on rheumatoid arthritis (RA) in rats, plus its underlying mechanisms. They showed that acupuncture helped RA outcome measures of paw oedema, pain responses, serum cytokines, synovial inflammation, in collagen-induced arthritis (CIA) rats.  They were able to show that RA worked by blocking a pathway in the synovium called TLR2/4, that activates immune response and inflammation.  The researchers therefore suggested the anti-inflammatory and analgesic effects of EA were related to the inhibition of TLR2/4 signalling on synovial fibroblasts and macrophages.

Electroacupuncture (EA) has been shown in a rat model (Li et al, 2008) to have anti-inflammatory benefits by modulating the hypothalamic-pituitary-adrenal (HPA) axis, (HPA axis regulates the stress response and immune function).  Specifically, Li et al outlined that EA sets off a cascade in the brain (via corticotropin-releasing hormone, and adrenocorticotropic hormone) to produce cortisol, which reduces inflammation and oedema.

You may also find this useful: our Rheumatoid Arthritis page

Resources

BAcC Osteoarthritis of the Knee Factsheet

Evidence Based Acupuncture Foundation Osteoarthritis Evidence Summary

References:

Araya-Quintanilla, F., Cuyúl-Vásquez, I. and Gutiérrez-Espinoza, H., 2022. Does acupuncture provide pain relief in patients with osteoarthritis knee? An overview of systematic reviews. Journal of Bodywork and Movement Therapies, 29, pp.117-126.

Birch, S., Lee, M.S., Alraek, T. and Kim, T.H., 2018. Overview of treatment guidelines and clinical practical guidelines that recommend the use of acupuncture: a bibliometric analysis. The Journal of Alternative and Complementary Medicine, 24(8), pp.752-769.

Corbett, M.S., Rice, S.J.C., Madurasinghe, V., Slack, R., Fayter, D.A., Harden, M., Sutton, A.J., Macpherson, H. and Woolacott, N.F., 2013. Acupuncture and other physical treatments for the relief of pain due to osteoarthritis of the knee: network meta-analysis. Osteoarthritis and cartilage, 21(9), pp.1290-1298.

Feng, Y., Zhang, R., Zhao, Z., He, Y., Pang, X., Wang, D. and Sun, Z., 2023. Efficacy and safety of electroacupuncture combined with medication for rheumatoid arthritis: A systematic review and meta-analysis. Heliyon.

Kavoussi B, Ross BE. The neuroimmune basis of anti-inflammatory acupuncture. Integr Cancer Ther 2007;  6:  251-7.

Li, A., Lao, L., Wang, Y., Xin, J., Ren, K., Berman, B.M., Tan, M. and Zhang, R., 2008. Electroacupuncture activates corticotrophin-releasing hormone-containing neurons in the paraventricular nucleus of the hypothalammus to alleviate edema in a rat model of inflammation. BMC Complementary and Alternative Medicine8(1), pp.1-8.

Li, Y., Yu, Y., Liu, Y. and Yao, W., 2022. Mast cells and acupuncture analgesia. Cells11(5), p.860.

Liu, J., Li, Y., Li, L., Luo, X., Li, N., Yang, X., Zhang, H., Liu, Z., Kang, D., Luo, Y. and Liu, Y., 2022. Effects of acupuncture at acupoints with lower versus higher pain threshold for knee osteoarthritis: a multicenter randomized controlled trial. Chinese Medicine, 17(1), pp.1-12.

Liu, F., Fang, J., Shao, X., Liang, Y., Wu, Y. and Jin, Y., 2014. Electroacupuncture exerts an anti-inflammatory effect in a rat tissue chamber model of inflammation via suppression of NF-κB activation. Acupuncture in Medicine32(4), pp.340-345.

Liu, C.Y., Tu, J.F., Lee, M.S., Qi, L.Y., Yu, F.T., Yan, S.Y., Li, J.L., Lin, L.L., Hao, X.W., Su, X.T. and Yang, J.W., 2022. Is acupuncture effective for knee osteoarthritis? A protocol for a systematic review and meta-analysis. BMJ open, 12(1), p.e052270.

McDonald, J.L., Cripps, A.W. and Smith, P.K., 2015. Mediators, receptors, and signalling pathways in the anti-inflammatory and antihyperalgesic effects of acupuncture. Evidence-Based Complementary and Alternative Medicine2015.

Manheimer E, Cheng K, Linde K, Lao L, Yoo J, Wieland S, et al. Acupuncture for peripheral joint osteoarthritis. Cochrane Database of Systematic Reviews 2010, Issue 1.

Manheimer, E., Cheng, K., Wieland, L.S., Shen, X., Lao, L., Guo, M. and Berman, B.M., 2018. Acupuncture for hip osteoarthritis. Cochrane Database of Systematic Reviews, (5).

Petti, F.., Bangrazi, A., Liguori, A., Reale, G. and Ippoliti, F., 1998. Effects of acupuncture on immune response related to opioid-like peptides. Journal of Traditional Chinese Medicine 18(1), pp.55-63.

Reinhold T, Witt CM, Jena S, Brinkhaus B, Willich SN. Quality of life and cost-effectiveness of acupuncture treatment in patients with osteoarthritis pain. Eur J Health Econ 2008;9(3):209-19.

Sun, S.Y., Yan, Q.Q., Qiao, L.N., Shi, Y.N., Tan, L.H. and Yang, Y.S., 2023. Electroacupuncture Alleviates Pain Responses and Inflammation in Collagen-Induced Arthritis Rats via Suppressing the TLR2/4-MyD88-NF-κB Signaling Pathway. Evidence-Based Complementary and Alternative Medicine2023.

Tian, H., Huang, L., Sun, M., Xu, G., He, J., Zhou, Z., Huang, F., Liu, Y. and Liang, F., 2022. Acupuncture for Knee Osteoarthritis: A Systematic Review of Randomized Clinical Trials with Meta-Analyses and Trial Sequential Analyses. BioMed Research International, 2022.

Vickers, A.J., Vertosick, E.A., Lewith, G., MacPherson, H., Foster, N.E., Sherman, K.J., Irnich, D., Witt, C.M., Linde, K. and Acupuncture Trialists’ Collaboration, 2018. Acupuncture for chronic pain: update of an individual patient data meta-analysis. The Journal of Pain, 19(5), pp.455-474.

Wang, M., Liu, W., Ge, J. and Liu, S., 2023. The immunomodulatory mechanisms for acupuncture practice. Frontiers in Immunology14.

White, A., Tough, L., Eyre, V., Vickery, J., Asprey, A., Quinn, C., Warren, F., Pritchard, C., Foster, N.E., Taylor, R.S. and Underwood, M., 2016. Western medical acupuncture in a group setting for knee osteoarthritis: results of a pilot randomised controlled trial. Pilot and feasibility studies2(1), pp.1-8.

Yu, W.L. and Kim, S.N., 2023. The effect of acupuncture on pain and swelling of arthritis animal models: A systematic review and meta-analysis. Frontiers in Genetics14.

Zhang, Q., Yue, J., Golianu, B., Sun, Z. and Lu, Y., 2017. Updated systematic review and meta-analysis of acupuncture for chronic knee pain. Acupuncture in Medicine, 35(6), pp.392-403.

Zijlstra, F.J., van den Berg-de Lange, I., Huygen, F.J. and Klein, J., 2003. Anti-inflammatory actions of acupuncture. Mediators of inflammation, 12(2), pp.59-69.

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Shaftesbury Clinic Star of Conditions

Surgery and Post Operative Pain – Condition Resources

Important to know: Chronic health conditions should be addressed under direct medical supervision of your GP or consultant, and acupuncture would be an adjunct or complement to usual care – we advise that you let you doctor know when you use this approach.

Our Nausea page may also be of use regarding Post Operative Nausea and Vomiting Research

Research and Resources on Post Operative Pain and Acupuncture:

A scholarly search of the available research papers on the terms “acupuncture” + “post operative pain” yields over 3,860 papers, and narrowing this to “RCT” to identify Randomised Controlled Trials, gives 583 results; of which 38% have been carried out since 2017 (Google Scholar). This suggests that acupuncture is being used in this area, leading to a small but growing body of research,, the pace of which has increased in recent years, indicating increased recognition that it is worthy of scientific appraisal regarding its potential role.

Interpreting the research:

When reading health research, it is important to know that Systematic Reviews or Meta Analyses of a large number of high-quality research studies are the very best way to be able to say to what extent a given treatment can address a condition, symptom, or set of symptoms.  The next best level of evidence is the individual Randomised Controlled Study (RCT) which uses a systematic technique to compare two or more groups of patients receiving different treatments (or a treatment against a “control”, or no treatment).  In acupuncture trials, the nature of the control group is of particular interest as it is hard to blind a patient to whether they are having a needle inserted or not, and even more challenging to blind the researcher/team to this.

The means and quality of how research is carried out varies considerably from country to country, and in terms of how an intervention is compared to another intervention (or a control).  Of note is the fact that “sham” acupuncture (where needles are placed in apparently inert locations rather than traditional acupuncture points) is not really an inert process as it has physiological effects, so that comparing sham and “true acupuncture” may therefore not give a clear picture alone; but and form a part of a research body where acupuncture versus no treatment, vs conventional treatment or vs a different approach/modality also form part of the evidence base.

The n= figure (where quoted in research) tells you how many people were participants in the study, and usually the larger a study (when it is of good quality and design), the more likely it is to be reliable and applicable to larger populations. When (statistical) “significance” is discussed in view of studies it has a very particular meaning – it is the confidence in the data (using statistical tests) that tells us how likely a result could have just come about by chance. The lower the possibility of a chance result, the more likely it is due to the intervention in the experiment. When you are reading a trial/study, the “p” is the number telling us of significance, and this must be under 5% (or p less than 0.05) to mean we can say it is a (statistically) “significant” result.

The Research:

Sun et al’s (2008) systematic review of 15 RCT’s (n=1166) in the British Journal of Anaesthesia drew the conclusion that acupuncture around the time of surgery “may be a useful adjunct for acute postoperative pain management.” They also found lower incidence of opioid side effects such as post-operative nausea and vomiting (PONV); dizziness and urinary retention in acupuncture groups. They also stated that further large and well-designed studies are needed to further examine this area including the most effective points and timings to use.

A systematic review of 5 trials for acupuncture post back surgery (Cho et al, 2015) found encouraging but limited evidence in this area, calling for more rigorously designed trials to further the research body. Chen et al (2021, 9 RCT’s; n=671) systematic review found acupuncture could improve function and reduce PONV after total knee arthroscopy surgery, with pain relief from acupuncture mainly achieved within the 48h post-surgery. Again limitations were acknowledged in the methodical quality of studies, with further large, high quality studies called for.

Wu et al (2016, systematic review of 13 studies) found that the evidence supported acupuncture use as an adjuvant therapy post surgery on the first day, significantly reducing postoperative pain and the use of opioids. A Systematic review of 35 trials into acupuncture and post-operative pain has indicated promise in this area, indicating that further research is needed as to whether using both local and distal points can be beneficial over an either/or approach (Zhu et al, 2019).

Kumar and Tewari (2023) reviewed the evidence for dental treatment during and post-op. Root canal treatment has a high incidence of postoperative pain and potential side effects from drug treatment; and they found that from their review of 5 studies (n=312), acupuncture reduced the failure of nerve block in patients with irreversible pulpitis and controlled pain both during (intraoperative) and postoperative pain from root canal.  Acupuncture lowered the amount of painkiller drugs needed. The researchers noted that more in-depth clinical research with larger studies was warranted due to the small number and variable quality of studies.  Additionally, against a backdrop of Covid-19, researchers advocated acupuncture, as a non-aerosol generating alternative that could assist in pain management whist awaiting treatment, or where other techniques were not appropriate.

Ben-Ayre et al (2023: n=99) conducted a randomised controlled trial that examined the impact of integrative therapies on pain and anxiety among patients undergoing gynaecological oncology (cancer) surgery; addition of intraoperative acupuncture significantly reduced severe pain, compared with the control group and the group that received preoperative touch/relaxation only.  The combination of preoperative touch/relaxation and intraoperative acupuncture also improved the patients’ scores in the Measure Yourself Concerns and Wellbeing (MYCAW) questionnaire.

A small Chinese study, Zhang et al’s (2013; n=40) RCT compared the effect of electroacupuncture (EA) combined with cervical plexus block (CPB) versus sham EA plus CPB on the stress response of patients undergoing thyroid surgery. EA plus CPB significantly reduced peri-operative cardiovascular stress responses and inhibited abnormal increases of stress hormones (as measured by blood pressure, ACTH and, epinephrine, glucose and cortisol levels) and inflammatory reaction (as measured by CRP levels) in patients undergoing thyroid surgery.

Mechanisms of action:

Acupuncture studies have shown it can: provide pain relief by stimulating nerves in body tissues and leading to endorphin release (natural painkilling substances), as well as downregulating the brain and nervous system’s reaction to stress and pain (Zhao 2008; Zijlstra et al, 2003; Pomeranz, 1987).

Acupuncture stimulates the body to create its own natural painkilling substances, such as Beta Endorphins (β-Endorphin). In studies acupuncture has been shown to stimulate the production of natural painkillers called opioid-like peptides (OLPs), including β-Endorphin: For example, this was shown in an RCT in 90 patients with a range of painful disorders (Petti et al, 1998). The same study showed acupuncture also and enhanced the activity of immune cells (lymphocytes, natural killer cells and monocytes) that help fight infections and diseases (Petti et al, 1998).

Acupuncture can activate mast cells at acupoints, which release histamine, serotonin, adenosine, and other mediators that modulate nerve transmission and inflammation (Li et al, 2022)

Animal Models

Acupuncture has been shown in animal models to promote the release of factors that involved in the reduction of inflammation (vascular and immunomodulatory factors – (Kim et al, 2008; Kavoussi and Ross, 2007 [review article]; Zijlstra et al, 2003), and also to affect levels of serotonin (in an animal model), and other peptides in the brain and nervous system and modulate blood flow in the brain and elsewhere in the body, in humans (Zhong and Li, 2007; Shi et al, 2010). More detail on neurotransmitters in acupuncture for pain is in our blog.

Electroacupuncture (EA) has been shown in a rat model (Li et al, 2008) to have anti-inflammatory benefits by modulating the hypothalamic-pituitary-adrenal (HPA) axis, (HPA axis regulates the stress response and immune function).  Specifically, Li et al outlined that EA sets off a cascade in the brain (via corticotropin-releasing hormone, and adrenocorticotropic hormone) to produce cortisol, which reduces inflammation and oedema.

Dental Surgery: Immune and Anti-Inflammatory Benefits

Lisboa et al (2015) looked at the effects of electroacupuncture (EA) on experimental periodontitis in 32 rats over 10 days. Rats with induced periodontitis were divided into three groups: electroacupuncture; sham electric needles; or no treatment. A control group of healthy rats without periodontitis was also included. Post treatment measures included alveolar bone loss and periodontal ligament space around the teeth; osteoclast activity and number as indicated by RANKL and TRAP; and cytokine levels (IL-1β, MMP-8, IL-6, and COX-2) in the gums. The electroacupuncture group had less bone loss, less osteoclast activity and number, and decreased inflammatory cytokines; these suggest modulation of the inflammatory response.

Post-Operative Inflammation and Immunity Study

Immune suppression can be a complication of major surgery, so Li et al (2013) carried out an RCT to examine the effect of electroacupuncture (EA) on immune function and point specificity in patients undergoing supratentorial craniotomy.  With n=29 in three groups; control, EA group, and sham acupoints.  EA partially reduced immune suppression after surgery, as measured by the levels of cytokines and immunoglobulins in peripheral blood, however without point specificity. They concluded EA may be a useful adjunct to general anaesthesia for improving immune function in patients undergoing major surgery, although sham acupuncture also produced some benefits, so further research in larger trials would be needed.

Resources:

Evidence Based Acupuncture – Factsheet on Chronic Pain

References:

Post-Operative Pain References:

Ben‐Arye, E., Segev, Y., Galil, G., Marom, I., Gressel, O., Stein, N., Hirsh, I., Samuels, N., Schmidt, M., Schiff, E. and Lurie, I., 2023. Acupuncture during gynecological oncology surgery: A randomized controlled trial assessing the impact of integrative therapies on perioperative pain and anxiety. Cancer129(6), pp.908-919.

Chen, Z., Shen, Z., Ye, X., Xu, Y., Liu, J., Shi, X., Chen, G., Wu, J., Chen, W., Jiang, T. and Liu, W., 2021. Acupuncture for Rehabilitation After Total Knee Arthroplasty: A systematic review and meta-analysis of randomized controlled trials. Frontiers in medicine7, p.1050.

Cho, Y.H., Kim, C.K., Heo, K.H., Lee, M.S., Ha, I.H., Son, D.W., Choi, B.K., Song, G.S. and Shin, B.C., 2015. Acupuncture for acute postoperative pain after back surgery: a systematic review and meta‐analysis of randomized controlled trials. Pain Practice15(3), pp.279-291.

Kumar, G. and Tewari, S., 2023. Acupuncture for Management of Endodontic Emergencies: a Review. Journal of Acupuncture and Meridian Studies, 16(1), pp.1-10.

Li, A., Lao, L., Wang, Y., Xin, J., Ren, K., Berman, B.M., Tan, M. and Zhang, R., 2008. Electroacupuncture activates corticotrophin-releasing hormone-containing neurons in the paraventricular nucleus of the hypothalammus to alleviate edema in a rat model of inflammation. BMC Complementary and Alternative Medicine8(1), pp.1-8.

Li, G., Li, S., Wang, B. and An, L., 2013. The effect of electroacupuncture on postoperative immunoinflammatory response in patients undergoing supratentorial craniotomy. Experimental and Therapeutic Medicine6(3), pp.699-702.

Li, Y., Yu, Y., Liu, Y. and Yao, W., 2022. Mast cells and acupuncture analgesia. Cells11(5), p.860.

Sun, Y., Gan, T.J., Dubose, J.W. and Habib, A.S., 2008. Acupuncture and related techniques for postoperative pain: a systematic review of randomized controlled trials. British journal of anaesthesia101(2), pp.151-160.

Wu, M.S., Chen, K.H., Chen, I.F., Huang, S.K., Tzeng, P.C., Yeh, M.L., Lee, F.P., Lin, J.G. and Chen, C., 2016. The efficacy of acupuncture in post-operative pain management: a systematic review and meta-analysis. PloS one11(3), p.e0150367.

Zhang, C.J., Yang, F. and Li, M., 2013. Effect of electroacupuncture combined with cervical plexus block on stress responses in patients undergoing thyroid surgery. Zhen ci yan jiu= Acupuncture Research38(1), pp.1-6

Zhu, J., Xu, Q., Zou, R., Wu, W., Wang, X., Wang, Y., Ji, F., Zheng, Z. and Zheng, M., 2019. Distal acupoint stimulation versus peri-incisional stimulation for postoperative pain in open abdominal surgery: a systematic review and implications for clinical practice. BMC complementary and alternative medicine19(1), pp.1-14.

Mechanism Of Action in Pain References:

Kavoussi B, Ross BE. The neuroimmune basis of anti-inflammatory acupuncture. Integr Cancer Ther. 2007 Sep;6(3):251-7.

Kim HW, Uh DK, Yoon SY et al. Low-frequency electroacupuncture suppresses carrageenan-induced paw inflammation in mice via sympathetic post-ganglionic neurons, while high-frequency EA suppression is mediated by the sympathoadrenal medullary axis. Brain Res Bull. 2008 Mar 28;75(5):698-705.

Petti, F.., Bangrazi, A., Liguori, A., Reale, G. and Ippoliti, F., 1998. Effects of acupuncture on immune response related to opioid-like peptides. Journal of Traditional Chinese Medicine 18(1), pp.55-63.

Pomeranz B. Scientific basis of acupuncture. In: Stux G, Pomeranz B, eds. Acupuncture Textbook and Atlas. Heidelberg: Springer-Verlag; 1987:1-18.

Shi H, Li JH, Ji CF, Shang HY, Qiu EC et al.[Effect of electroacupuncture on cortical spreading depression and plasma CGRP and substance P contents in migraine rats]. Zhen Ci Yan Jiu. 2010 Feb;35(1):17-21.

Zhao ZQ. Neural mechanism underlying acupuncture analgesia. Prog Neurobiol. 2008 Aug;85(4):355-75.

Zhong G.-W. Li W. Effects of acupuncture on 5-hydroxytryptamine1F and inducible nitricoxide synthase gene expression in the brain of migraine rats. Journal of Clinical Rehabilitative Tissue Engineering Research. 2007;11(29)(pp 5761-5764)

Zijlstra FJ, van den Berg-de Lange I, Huygen FJ, Klein J. Anti-inflammatory actions of acupuncture. Mediators Inflamm. 2003 Apr;12(2):59-69.

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