Chinese Herbal Medicine and Endometriosis: Research Summary
Summary
Chinese herbal medicine is a promising area of endometriosis research, with the strongest evidence suggesting potential benefits for pain support, postoperative recovery and tolerability, especially when used alongside conventional care. Published trials and reviews have also reported fewer side effects than some hormonal comparators, including fewer hot flushes and less irregular bleeding. The evidence is encouraging and growing, although most studies have been conducted in China and large definitive UK trials have not yet been completed.
Endometriosis can affect every part of life. From period pain and pelvic pain to sex, energy, fertility, work and overall well being.
For many women, support is not about choosing one path over another. It is about finding the combination that helps them feel better, function better and live more comfortably.
That is one reason Chinese herbal medicine has attracted growing scientific interest in endometriosis. Over the last decade, the evidence base has expanded from a handful of small studies into a much broader body of peer-reviewed research, including randomised trials, placebo-controlled data and meta-analyses.
The picture that is emerging is encouraging: Chinese herbal medicine may offer meaningful support in endometriosis, particularly for pain, postoperative care and treatment tolerability.
A Growing Research Base
One of the earliest major reviews in this area was the 2012 Cochrane review by Flower et al. At that point, only two randomised trials involving 158 women met the inclusion criteria. Those studies suggested symptom benefits comparable to gestrinone and danazol, with fewer side effects, but the evidence was too limited for firm conclusions.
Since then, the field has moved on substantially.
Newer research now includes:
- A multicentre double-blind placebo-controlled trial
- A large meta-analysis covering 34 randomised trials and 3,389 participants
- A focused postoperative meta-analysis of Salvia miltiorrhiza-containing formulas
- Post-surgical trials exploring recurrence, pregnancy and quality of life
- UK feasibility research showing that individualised Chinese herbal medicine can be tested rigorously against placebo in real-world practice
What the Evidence Says
Pain Support
Pain is one of the clearest areas of promise.
The broadest recent review, published in 2023, analysed 34 randomised trials involving 3,389 participants. The strongest signal emerged when Chinese herbal medicine was used alongside conventional treatment, with significant reductions in:
- Period pain
- Pelvic pain
- Pain during sex
This is an important pattern. It suggests Chinese herbal medicine may be particularly useful as a complementary approach within a wider treatment plan, rather than as an alternative.
Some benefits also appeared to continue for a period after treatment stopped, particularly for period pain, although they were not consistently maintained long term. Even so, the short-term pain findings are among the most encouraging in the research literature.
Better Tolerability Than Some Hormonal Treatments
One of the most consistent findings across the literature is tolerability.
Across trials and reviews, Chinese herbal medicine has repeatedly been associated with fewer side effects than some standard hormonal therapies, including GnRH agonists, danazol and gestrinone.
In the 2023 meta-analysis, Chinese herbal medicine was associated with significantly fewer hot flushes and less irregular vaginal bleeding than conventional therapy. The broader pattern across the evidence is that women in herbal medicine groups often experienced fewer treatment-related symptoms than those receiving hormonal comparators.
For many people with endometriosis, that matters just as much as symptom relief. A treatment only works in real life if it is something people can realistically stay with.
Postoperative Support and Recurrence
Post-surgical care is another especially promising area.
A 2022 meta-analysis looked specifically at formulas containing Salvia miltiorrhiza alongside GnRH agonist treatment after surgery. This is important because it narrows the focus from mixed herbal formulas to a more defined family of interventions.
Across 10 randomised trials and 836 patients, the findings were striking:
- Recurrence risk was reduced by 74%
- Pregnancy rates were nearly doubled, from around 26% to 51%
- CA-125 levels were lower
- Hot flashes and vaginal bleeding were less common
What makes this meta-analysis stand out is the consistency of the findings. For recurrence, pregnancy and adverse-event outcomes, heterogeneity was zero across the included trials. The recurrence outcome was also rated high quality under GRADE assessment, which is unusual in this field.
Fertility Outcomes
Fertility is one of the most interesting areas of newer research.
The strongest single trial in the literature is a 2020 multicentre double-blind placebo-controlled study involving 202 women with endometriosis-associated infertility after surgery. Women received either matched placebo or a sequential Chinese herbal medicine protocol over six menstrual cycles.
The results were encouraging:
- Clinical pregnancy rate was 44.6% in the herbal group vs 29.7% in placebo
- Live birth rate was 34.7% vs 20.8%
- Ovulation outcomes also improved
- Adverse events were similar between groups
At the same time, the fertility picture is not completely one-directional. A registered three-arm trial published in 2014 found no significant fertility benefit when a Chinese herbal formula was added to oral contraceptive treatment, although pain outcomes were better in the combined group.
The most accurate reading is that Chinese herbal medicine has shown positive fertility-related findings in some important studies, but more research is needed in this area.
What Makes This Area Scientifically Interesting
Researchers are not only looking at symptom scores. They are also exploring biological mechanisms that may help explain the clinical findings.
In the literature on Salvia miltiorrhiza-containing formulas, authors discuss anti-inflammatory activity, circulation-related effects and pain-pathway modulation. Lower CA-125 levels reported in postoperative trials add further interest.
This does not turn herbal medicine into a shortcut or a miracle. But it does help explain why this field continues to attract serious research attention.
Long-Term Quality of Life
There is also early evidence that Chinese herbal medicine may have a role in longer-term management after surgery.
A 2021 trial in women with stage III–IV endometriosis found similar recurrence control across herbal medicine, continued GnRHa and oral contraceptives over long-term follow-up, but substantially better sexual function in the herbal group than in the GnRHa or oral contraceptive groups.
This is especially relevant in real life, because side effects and reduced quality of life are among the main reasons women stop long-term hormonal treatment.
It is a smaller and more preliminary study than the major meta-analyses, but it points to an important question: not just whether treatment controls recurrence, but how women actually feel while taking it.
Where we are Today
Based on the published research, Chinese herbal medicine appears to have preliminary evidence of effectiveness in endometriosis-associated pain, especially when used alongside conventional care.
It also appears to have better tolerability than several standard hormonal comparators, with fewer side effects reported across trials and reviews.
Postoperative use is a particularly promising area, especially in studies involving Salvia miltiorrhiza-containing formulas, where recurrence and pregnancy findings have been notably strong.
And while research in fertility and long-term quality of life is still evolving, the results so far are strong enough to justify serious attention.
Large definitive trials with blinding and placebo control outside China, including in the UK, are still needed. But the existing evidence is already substantial enough to support genuine optimism, especially around pain, postoperative recovery, recurrence support and treatment tolerability.
Safety and Quality Matter
As with any herbal or supplement approach, quality matters. NHS guidance notes that herbal medicines can interact with medicines, may cause side effects and may not be suitable for everyone, including during pregnancy or before surgery. It also highlights that product quality can vary, particularly when products are bought online or by mail order.
So the most sensible approach is an informed one: choose carefully, and speak to a GP, pharmacist or specialist if you are taking medication, trying to conceive, pregnant, or preparing for surgery.
FAQ
Can Chinese herbal medicine help with endometriosis pain? Research suggests it may. The strongest evidence is for endometriosis-associated pain, particularly when Chinese herbal medicine is used alongside conventional treatment.
Is Chinese herbal medicine better tolerated than hormonal treatment? Published trials and reviews consistently suggest it may be better tolerated than some hormonal comparators, with fewer hot flushes, less irregular bleeding and fewer treatment-related side effects reported in several studies.
Is there research behind it? Yes. The evidence includes placebo-controlled research, multicentre randomised trials, large meta-analyses and postoperative studies. The field has grown significantly since the 2012 Cochrane review.
Is the evidence strongest when used alone or alongside conventional care? Alongside conventional care. The clearest and most consistent benefits in the research appear when Chinese herbal medicine is used as a complementary approach rather than a replacement.
Has this been studied in the UK? There is UK research, including a feasibility study showing that individualised Chinese herbal medicine decoctions can be blinded against placebo in routine practice. However, large definitive UK effectiveness trials have not yet been completed.
References
Flower et al. (2012). Chinese herbal medicine for endometriosis. Cochrane Database of Systematic Reviews. DOI: 10.1002/14651858.CD006568.pub3
Flower et al. (2011). A Feasibility Study Exploring the Role of Chinese Herbal Medicine in the Treatment of Endometriosis. The Journal of Alternative and Complementary Medicine. DOI: 10.1089/acm.2010.0073
Zhao et al. (2020). Chinese Medicine Sequential Therapy Improves Pregnancy Outcomes after Surgery for Endometriosis-Associated Infertility: A Multicenter Double-Blind Placebo Randomized Controlled Trial. Chinese Journal of Integrative Medicine. DOI: 10.1007/s11655-019-3208-2
Zhao et al. (2013). Controlling the Recurrence of Pelvic Endometriosis after a Conservative Operation: Comparison between Chinese Herbal Medicine and Western Medicine. Chinese Journal of Integrative Medicine. DOI: 10.1007/s11655-012-1247-z
Lin et al. (2023). Chinese Herbal Medicine, Alternative or Complementary, for Endometriosis-Associated Pain: A Meta-Analysis. The American Journal of Chinese Medicine. DOI: 10.1142/s0192415x23500386
Zhu et al. (2014). Post-laparoscopic oral contraceptive combined with Chinese herbal mixture in treatment of infertility and pain associated with minimal or mild endometriosis: a randomized controlled trial. BMC Complementary and Alternative Medicine. DOI: 10.1186/1472-6882-14-222
Gao et al. (2022). Salvia miltiorrhiza-Containing Chinese Herbal Medicine Combined With GnRH Agonist for Postoperative Treatment of Endometriosis: A Systematic Review and Meta-Analysis. Frontiers in Pharmacology. DOI: 10.3389/fphar.2022.831850
Ruan et al. (2021). Efficacy and Safety of SanJieZhenTong Capsules, a Traditional Chinese Patent Medicine, on Long-term Management of Endometriosis: A Randomized Controlled Trial. Reproductive and Developmental Medicine. DOI: 10.4103/2096-2924.313687