If you grew up in a Chinese household, you probably heard some version of it: keep your feet warm during your period, skip the iced drinks, drink the ginger tea your grandmother made. Behind that advice sits a complete medical tradition with its own way of describing the menstrual cycle, one that predates hormone science by about two thousand years and still shapes how hundreds of millions of women think about their periods.
This article explains that framework as a framework: what traditional Chinese medicine (TCM) means by blood, qi and cold, how it divides the cycle into phases, and which classical recipes grew out of those ideas. It then does something the tradition itself rarely does, which is to ask what controlled trials and systematic reviews have found when those recipes and acupuncture were tested for period pain and premenstrual symptoms. The short answer is that the trials are numerous, mostly encouraging and mostly of poor quality, and we try to be precise about what that combination does and does not tell you.
We cover the physiology of the cycle in our guide to the four phases of the menstrual cycle, and the mechanics of cramps in why period cramps happen. This piece is about the other map.
A Different Map of the Same Territory
Biomedicine describes the cycle through hormones: estrogen and progesterone rising and falling, the ovary releasing an egg, the uterine lining building and shedding. TCM was built without any of those concepts. It describes the same observable events (bleeding, fertile mucus, breast tenderness, mood shifts, cramps) through a different vocabulary: the ebb and flow of blood, qi, yin and yang through a set of channels and organ systems.
Three ideas matter most for understanding how TCM talks about periods.
Blood (xue). In TCM, blood is more than the red fluid. It is the nourishing, moistening substance that the uterus (which the classics call the bao gong, the "palace of the child") stores and releases each month. A period is the uterus emptying its stored blood. Heavy, pale or scanty flow, and a dull ache after bleeding ends, are read as signs about the quantity and quality of blood.
Qi. Qi is the tradition's word for functional activity: the force that moves blood, keeps it in the vessels and keeps the organs working. Blood is said to be moved by qi. When qi is "stagnant," classically from stress or frustration, blood is thought to move poorly too, giving distension, breast tenderness and irritability before a period, and clotted, cramping flow during it.
Cold and heat. This is the idea most people recognize. Cold is thought to contract and slow; heat to accelerate and disperse. Cold entering the lower abdomen, whether from the weather, from cold food and drink, or from an internal lack of warming yang, is said to "congeal" blood so that it stops flowing smoothly. The result, in the tradition's description, is sharp cramping pain that eases with warmth and pressure, dark flow with clots, and cold hands and feet. Heat, by contrast, is linked with early, heavy, bright-red bleeding.
Two organ systems do most of the work in TCM gynecology. The Liver (with a capital L, because it is a functional system rather than the anatomical organ) stores blood and governs the smooth flow of qi, which is why emotional stress is so often blamed for menstrual irregularity. The Kidney stores jing, the deep reproductive essence, and is held responsible for the timing and reliability of the cycle from first period to menopause. The Spleen, which in TCM governs digestion, makes the blood in the first place, which is why food matters so much in this tradition.
Patterns, Not Diagnoses
A TCM practitioner does not diagnose "primary dysmenorrhea." She identifies a pattern (zheng), a cluster of signs that points to what is believed to have gone wrong, and prescribes against the pattern. Two women with identical period pain can leave with different herbs. A 2025 review of TCM approaches to primary dysmenorrhea in Frontiers in Endocrinology describes pain "caused by the cold generated inside or outside the body" as one of the central explanations, alongside stagnation and deficiency.
| Pattern | How the tradition describes it | Traditional approach |
|---|---|---|
| Cold congealing with blood stasis | Sharp cramps that ease with heat, dark clotted flow, cold hands and feet | Warm the uterus and move blood (Wen Jing Tang, Shao Fu Zhu Yu Tang) |
| Qi stagnation with blood stasis | Distending pain, breast tenderness, irritability, clots | Move qi and blood (Xiao Yao San and its variants, Chai Hu Shu Gan San) |
| Qi and blood deficiency | Dull ache during or after the period, pale scanty flow, fatigue, pallor | Nourish blood and qi (Si Wu Tang, Ba Zhen Tang) |
| Kidney deficiency | Low back ache, irregular timing, dizziness, tinnitus | Nourish the Kidney, warm or cool depending on the sub-pattern |
| Damp-heat | Burning pain, heavy sticky flow, discharge, a feeling of heaviness | Clear heat and drain dampness |
The pattern system is internally consistent and clinically useful to its practitioners, but it is important to be clear about its status. It is a classification based on observed signs, not on measured physiology. "Blood stasis" has no laboratory marker. When researchers test TCM recipes, they often recruit by Western diagnosis and TCM pattern together, which is one reason the trial literature is so hard to compare from one study to the next.
Tiao Jing: Regulating the Cycle in Four Phases
Tiao jing (调经) means "regulating the menses," and it is the organizing goal of TCM gynecology. Where biomedicine mostly intervenes on a symptom (pain, heavy bleeding), tiao jing aims to bring the whole cycle into a regular, pain-free rhythm, and the main tool for doing that is to change the approach across the month rather than giving the same thing every day.
Modern TCM gynecology, drawing on twentieth-century physicians such as Xia Guicheng of Nanjing, commonly divides the cycle into four phases that map loosely onto the biomedical ones:
- Menstrual phase (roughly days 1 to 5). The uterus is emptying. The aim is to help blood move out smoothly and warmly: moving, warming herbs; warmth on the abdomen; rest.
- Post-menstrual phase (after bleeding, roughly the follicular phase). Blood and yin are considered depleted and are rebuilt. This is when nourishing recipes such as Si Wu Tang are traditionally given.
- Mid-cycle (around ovulation). Yin is said to reach its peak and turn toward yang. The aim is to support that transition, often with gentle qi-moving herbs.
- Premenstrual phase (the luteal phase). Yang and qi are supported and kept moving so that the coming period arrives on time and without stagnation. This is where premenstrual symptoms are addressed.
Whether this phased approach is any better than giving one recipe all month has barely been tested. One small randomized trial published in 2026 in Frontiers in Endocrinology compared a cycle-phased herbal protocol against ibuprofen in 80 women with primary dysmenorrhea over three cycles: Si Wu Tang with Chai Hu Shu Gan San after the period, and a warming, stasis-clearing recipe before and during it. Both groups reported the same high response rate (97.5 percent) by the third cycle; ibuprofen worked faster, and the herbal group reported far fewer recurrences after stopping (12.8 percent versus 89.7 percent). It is one unblinded trial from a single hospital, and the recurrence comparison is between a three-month herbal course and a two-day painkiller, so it is best read as a reason for a bigger trial rather than as a result.
If you want the biomedical version of the same four-phase story, see the four phases of the menstrual cycle and the luteal phase explained.
The Classical Recipes
A handful of prescriptions recur in TCM gynecology, most of them more than a thousand years old. They are not "the TCM answer to cramps"; they are starting points that practitioners modify to the pattern in front of them. Four come up constantly.
Wen Jing Tang (温经汤), "Warm the Menses Decoction"
Recorded in Zhang Zhongjing's Jin Gui Yao Lue (around 200 CE), Wen Jing Tang is the classic recipe for cold with blood stasis and underlying deficiency. It combines warming ingredients (cinnamon twig, fresh ginger, evodia) with blood-nourishing ones (dang gui, or angelica root; white peony; donkey-hide gelatin; ophiopogon), together with ginseng, moutan bark, pinellia, licorice and chuan xiong (Sichuan lovage). It is the recipe most often given for painful or irregular periods attributed to cold, and it survives in Japanese Kampo practice as unkeito. Practitioners adjust it to the person in front of them, and modern preparations vary the classical list.
Si Wu Tang (四物汤), "Four Substances Decoction"
Si Wu Tang is the foundational blood-nourishing recipe of the tradition: dang gui, white peony, prepared rehmannia and chuan xiong (Sichuan lovage). It appears in the Song-dynasty Taiping Huimin Heji Jufang, and the 2025 Frontiers review calls it the "first prescription for the treatment of female diseases." It is traditionally given after a period, in the post-menstrual phase, to rebuild blood, and it is the base from which dozens of other recipes are built, including Ba Zhen Tang, which appears in many Chinese postpartum soups.
Dang Gui Shao Yao San (当归芍药散)
Also from the Jin Gui Yao Lue, this recipe pairs dang gui and a large dose of white peony with chuan xiong and three "damp-draining" ingredients (poria, atractylodes and alisma). It is traditionally used for abdominal pain with bloating or fluid retention around the period, and it is one of the most prescribed menstrual recipes in Japan and Korea, where it is known as tokishakuyakusan and dangguijagyag-san.
Xiao Yao San and Jia Wei Xiao Yao San
The "Free and Easy Wanderer" recipes are the standard approach to Liver qi stagnation, the pattern most associated with premenstrual irritability, breast tenderness and bloating. A 2014 analysis of 14,312 Chinese herbal prescriptions for premenstrual syndrome in Taiwan's national health insurance database found that Jia Wei Xiao Yao San was the single most prescribed recipe, appearing in 37.5 percent of prescriptions.
The Fourth Trimester makes teas from dried culinary and herbal ingredients, drawn from recipes traditionally prepared in China around the menstrual cycle. That is the tradition behind our Premenstrual Tea.
Explore the Menstrual Cycle rangeWhat Systematic Reviews Actually Say
This is where the article has to slow down, because the honest answer is more complicated than either "it works" or "it doesn't."
Chinese herbal medicine for period pain
The relevant Cochrane review is Chinese herbal medicine for primary dysmenorrhoea by Zhu and colleagues. Its current version was published in 2008 and its searches run to January 2007. It has not been updated since, so it does not include the many trials published over the past two decades. It pooled 39 randomized trials with 3,475 women. Compared with pharmaceutical drugs (mostly NSAIDs and the pill), herbal medicine was associated with roughly twice the rate of reported improvement in pain (14 trials; risk ratio 1.99). But the three placebo-controlled trials could not be combined, so the comparison that matters most for separating a real effect from expectation was left "unclear." The authors called the evidence "promising" and in the same sentence said it was "limited by the poor methodological quality of the included trials." Most trials were small, many came from Chinese journals with little description of randomization or blinding, and nearly all used a loosely defined "effective rate" rather than a validated pain scale.
Reviews of individual recipes since then tell the same story. A 2017 meta-analysis in Archives of Gynecology and Obstetrics pooled 18 trials (1,736 women) of Wen Jing Tang against NSAIDs and found better pain scores for the herbal group, then rated the quality of that evidence as low because of a high risk of bias in the included studies. A 2020 systematic review in Medicine of Dang Gui Shao Yao San found 14 randomized trials; against placebo, the recipe lowered pain by about 1.1 points on a 10-point scale and reduced the use of rescue painkillers, and the authors again judged the quality of the evidence "relatively low."
The single best-designed trial of a classical recipe cuts the other way. A 2007 double-blind, placebo-controlled pilot trial in Taiwan, published in PLoS ONE, gave 78 women with gynecologist-confirmed primary dysmenorrhea either Si Wu Tang capsules or placebo for five days per cycle over three to four cycles. At the end of the course, the difference between the groups was not statistically significant. A difference did appear in the first follow-up cycle after stopping, which the authors called unexpected and worth further study, and there were no more adverse symptoms with the herbs than with placebo. Note that the trial used the plain four-herb base and gave it to everyone regardless of pattern, which a practitioner treating an individual would not do, though fixed household versions of these recipes have always existed, and which is exactly the tension at the heart of testing TCM with trial methods.
Acupuncture and acupressure
The Cochrane review Acupuncture for dysmenorrhoea (Smith and colleagues, 2016, searches to September 2015) is the current version and is much larger: 42 randomized trials and 4,640 women. Its conclusion is blunt: "there is insufficient evidence to demonstrate whether or not acupuncture or acupressure are effective in treating primary dysmenorrhoea." Against sham acupuncture, findings were inconsistent, and the only trial at low risk of bias in every domain found no difference from sham at three, six or twelve months. Against NSAIDs, acupuncture looked better in every trial that reported pain scores, but the trials were too different from one another to pool and were rated low quality. The evidence was graded low or very low for every comparison, with risk of bias, poor reporting and probable publication bias as the main problems. For most comparisons, no data on adverse events were reported at all.
Chinese herbal medicine for PMS
The Cochrane review Chinese herbal medicine for premenstrual syndrome (Jing and colleagues, 2009) found only two eligible randomized trials, with 549 women between them, and concluded that "there is insufficient evidence to support the use of Chinese herbal medicine for PMS." Given how widely recipes such as Jia Wei Xiao Yao San are prescribed for premenstrual symptoms, that is a striking gap, and the review is now old enough that it should be read as a snapshot of 2007 rather than of today.
How to read all this
- Lots of trials, mostly positive, mostly weak. Positive results from unblinded trials with vague outcomes are what you would expect even if the herbs did nothing beyond expectation and attention. They are also what you would expect if the herbs worked. The literature cannot yet tell those two possibilities apart.
- The placebo comparisons are the thin part. Herbs usually "beat" NSAIDs on an effective rate; they seldom beat a convincing placebo on a validated scale; where they do, as with Dang Gui Shao Yao San, the trials are small, and the one well-blinded trial of Si Wu Tang did not.
- Safety data are missing, not reassuring. Most trials did not report adverse events. Absence of reports is not evidence of safety.
- Both Cochrane reviews are old by Cochrane standards. The herbal review summarizes what was known in early 2007, and the acupuncture review stops at 2015. Newer meta-analyses exist, and they generally reach the same "positive but low quality" verdict.
None of that is a reason to dismiss the tradition. It is a reason to describe it as what it is: a long, internally coherent practice whose clinical claims remain largely untested to modern standards.
Safety and Finding a Practitioner
If you decide to see a TCM practitioner for menstrual symptoms, a few practical points.
- Product quality is the main risk. The NIH's National Center for Complementary and Integrative Health notes that some Chinese herbal products have been found to contain undeclared drugs (including the blood thinner warfarin and the anti-inflammatory diclofenac), heavy metals such as lead, arsenic and cadmium, pesticides, and the wrong herbs, with organ damage in some cases. Buy from a licensed practitioner or a reputable, tested source rather than from unlabeled imports.
- Dang gui and blood thinners. Memorial Sloan Kettering's herb database entry for dong quai (dang gui), the backbone of almost every menstrual recipe, warns that it may add to the effect of anticoagulants such as warfarin, can cause skin sensitivity to sunlight, and should be avoided in pregnancy. If you take any blood-thinning medication, have a hormone-sensitive condition, or might be pregnant, say so before you are prescribed anything.
- Tell your other clinicians. NCCIH's standing advice is to tell every health care provider about any herbal product you use, and not to use TCM to replace or delay conventional care.
- Check credentials. In most US states, acupuncturists are licensed, and herbal practitioners can hold certification in Chinese herbology from the NCCAOM. Ask.
- Needles are generally safe; heat is not always. Acupuncture with sterile single-use needles by a trained practitioner carries a low risk. The 2025 Frontiers review notes that moxibustion and cupping can cause burns, blisters and skin infections.
When to Talk to a Clinician
Whatever framework you prefer, some period symptoms need a medical workup rather than a pattern diagnosis. The American College of Obstetricians and Gynecologists advises talking to an ob-gyn about painful periods in general, and describes secondary dysmenorrhea, pain caused by a condition such as endometriosis, fibroids or adenomyosis, as pain that tends to get worse over time, lasts longer than ordinary cramps, may begin a few days before a period and may not stop when it ends. See a clinician promptly if:
- your period pain is getting worse year on year, or no longer responds to over-the-counter painkillers;
- pain occurs outside your period, during sex, or when urinating or passing stool;
- you bleed between periods or after sex, or your periods have become much heavier;
- pain comes with fever, unusual discharge, or faintness.
Our guide to why period cramps happen covers the warning signs for endometriosis in more detail, and what is PMS explains when premenstrual symptoms cross into premenstrual dysphoric disorder.
Frequently Asked Questions
Does traditional Chinese medicine work for period pain?
The evidence is unresolved. A 2008 Cochrane review of 39 trials found "promising" results for Chinese herbal medicine but said they were limited by the poor quality of the trials, and its three placebo-controlled trials could not be combined. The 2016 Cochrane review of acupuncture, covering 42 trials, found insufficient evidence to say whether it works. Larger, blinded, placebo-controlled trials are still needed.
What does TCM mean by "cold" in the uterus?
In TCM, cold is a quality that contracts and slows. Cold entering the lower abdomen, from weather, cold food and drink, or a lack of internal warmth, is thought to congeal blood so that it does not flow smoothly, producing cramping pain that eases with heat, dark clotted flow and cold hands and feet. It is a traditional explanatory model, not a measured physiological state.
Are Chinese herbal recipes for periods safe?
The herbs in classical recipes have long histories of use, but product quality varies and trials rarely report side effects. NCCIH has documented Chinese herbal products contaminated with drugs, heavy metals and the wrong herbs, and dang gui may interact with blood thinners and should be avoided in pregnancy. Use a licensed practitioner and a tested source, and tell your other clinicians what you are taking.
References
Zhu, X., Proctor, M., Bensoussan, A., Wu, E. & Smith, C.A. (2008). Chinese herbal medicine for primary dysmenorrhoea. Cochrane Database of Systematic Reviews, 2008(2), CD005288. Cochrane
Smith, C.A., Armour, M., Zhu, X., Li, X., Lu, Z.Y. & Song, J. (2016). Acupuncture for dysmenorrhoea. Cochrane Database of Systematic Reviews, 2016(4), CD007854. Cochrane
Jing, Z., Yang, X., Ismail, K.M., Chen, X. & Wu, T. (2009). Chinese herbal medicine for premenstrual syndrome. Cochrane Database of Systematic Reviews, 2009(1), CD006414. PubMed
Yeh, L.L., Liu, J.Y., Lin, K.S. et al. (2007). A randomised placebo-controlled trial of a traditional Chinese herbal formula in the treatment of primary dysmenorrhoea. PLoS ONE, 2(8), e719. PubMed
Gao, L., Jia, C., Zhang, H. & Ma, C. (2017). Wenjing decoction (herbal medicine) for the treatment of primary dysmenorrhea: a systematic review and meta-analysis. Archives of Gynecology and Obstetrics, 296(4), 679-689. PubMed
Seo, J., Lee, H., Lee, D. & Jo, H.G. (2020). Dangguijagyag-san for primary dysmenorrhea: A PRISMA-compliant systematic review and meta-analysis of randomized-controlled trials. Medicine, 99(42), e22761. PubMed
Xu, B., Zhuang, M., Wang, X. & Zhang, T. (2026). Cai's gynecology cyclical therapy with stasis-clearing and meridian-warming method for primary dysmenorrhea: a randomized controlled trial. Frontiers in Endocrinology, 17, 1752657. PubMed
Duan, W., Chen, D., Li, D. et al. (2025). Traditional Chinese medicine treatment strategies for primary dysmenorrhea. Frontiers in Endocrinology, 16, 1580051. Frontiers
Chen, H.Y., Huang, B.S., Lin, Y.H. et al. (2014). Identifying Chinese herbal medicine for premenstrual syndrome: implications from a nationwide database. BMC Complementary and Alternative Medicine, 14, 206. PubMed
National Center for Complementary and Integrative Health (2019). Traditional Chinese Medicine: What You Need To Know. NCCIH
Memorial Sloan Kettering Cancer Center (2026). Dong Quai. About Herbs, Botanicals & Other Products. MSKCC
American College of Obstetricians and Gynecologists (2020). Dysmenorrhea: Painful Periods. ACOG