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What is traditional Chinese medicine, and what does it say about digestion?

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What is traditional Chinese medicine? Traditional Chinese medicine (TCM) is the medical system of China, built on classical texts such as the Huangdi Neijing, Shang Han Lun and Shennong Bencao Jing, which scholars date to the Warring States and Han periods, and standardized under that name in the People’s Republic from the 1950s. It describes the body through qi, yin and yang, five phases and organ systems, and approaches a gut complaint by naming a pattern and choosing a formula and diet. The NCCIH says studies of Chinese herbal products have had mixed results and that many are of poor quality.

Five TCM digestive patterns with a classical formula for each: spleen qi deficiency with Si Jun Zi Tang, food stagnation with Bao He Wan, damp-heat with Ge Gen Qin Lian Tang, liver qi overacting on the spleen with Tong Xie Yao Fang, and stomach cold with Li Zhong Wan.
Source: Liu et al., Chinese Herbal Medicines, 2023; classical formula texts as summarized in standard TCM references. SuppleGut chart, free to reuse with attribution.

Traditional Chinese medicine, usually shortened to TCM, is the medical system of China and the source of the words on a growing share of gut-supplement labels: “spleen qi,” “dampness,” “food stagnation,” “Six Gentlemen.” This guide covers its origins, structure, account of digestion, clinical method, users and the trials of its gut formulas. Each term is defined one by one in the glossary guide, and the TCM section lists every guide in the series.

Where TCM comes from

The NCCIH says only that traditional Chinese medicine has evolved over thousands of years. The works practitioners still cite are dated by scholars in ranges, because each was assembled and edited over centuries:

The system in its present form is younger. From the 1950s the People’s Republic standardized its precepts, tried to integrate them with modern anatomy and pathology, and sponsored the combining of Chinese and Western medicine (Taylor, 2005); Chengdu, Guangzhou and Shanghai were among the first four TCM colleges, founded in 1956. The English phrase “traditional Chinese medicine” belongs to the same decade; the writer Ian Johnson credits party propagandists in 1955. “TCM” names the version standardized then; Kampo in Japan and Korean medicine are related traditions with formulas of their own.

How the system is structured

TCM describes the body through a set of categories. They are the tradition’s own vocabulary, and none of them is a measurement in modern physiology.

What TCM says about digestion

TCM treats digestion as the work of a pair, the spleen and the stomach. A 2023 review of TCM for functional dyspepsia calls them “the hub for the movement of qi in and out of the human body.” In the usual teaching the stomach receives and ripens food while the spleen “transforms and transports” it. When spleen qi is weak, the review says, qi stagnates in the middle of the body, and phlegm, water dampness and blood stasis can follow; dampness is linked to a weak spleen combined with fatty, sweet and rich food (Liu et al., Chinese Herbal Medicines, 2023). These are the tradition’s explanations, not physiology. The patterns that come up most for the gut are:

How a practitioner approaches a gut complaint

In the tradition’s account, the practitioner asks about appetite, stools, pain, thirst, response to heat and cold, sleep and stress, then examines the tongue (its color and coating) and the pulse at the wrist. The findings are sorted into a pattern, and a formula is built for it with the jun chen zuo shi principle: a chief herb aimed at the main pattern, deputies that reinforce it, assistants that moderate side effects or deal with secondary complaints, and an envoy that directs the formula and harmonizes it. In the usual reading of Si Jun Zi Tang, ginseng is the chief, atractylodes the deputy, poria the assistant and honey-fried licorice the envoy. A review notes that the modern scientific basis of this compatibility theory has not been clarified (LJMU repository). Diet advice follows the pattern.

A formula reaches the patient in one of four forms. A decoction is the raw herbs simmered in water and drunk as a tea. A granule is a concentrated dried extract that dissolves in hot water. A teapill is a small pill made from the herbs, taken by the handful. A patent medicine is a ready-made formula sold under its classical name in pill, tablet or capsule form; the labels we read give a blend total and an ordered list of herbs with no amount for each herb.

Who uses TCM

What the human evidence looks like

The NCCIH’s summary is that studies of Chinese herbal products have had mixed results and that, because many are of poor quality, no firm conclusions about effectiveness can be drawn. For the gut the evidence is mostly trials of formulas:

The trial tables sit in TCM formulas for digestion: what the trials show and Does Chinese herbal medicine work for IBS?.

Safety, and what a buyer can check

The NCCIH lists what Chinese herbal products have contained: heavy metals such as arsenic, lead and cadmium, undeclared drugs including warfarin and diclofenac, pesticides, sulfites and incorrect herbs, some of which caused organ damage. The most thoroughly documented case is Belgian: slimming pills in which Stephania tetrandra had been replaced by Aristolochia fangchi, which contains aristolochic acid. Among 39 patients with end-stage kidney disease who agreed to preventive surgery, 18 (46%) had urothelial carcinoma (Nortier et al., NEJM, 2000). A California survey of 260 Asian patent medicines found that 83, or 32%, held undeclared drugs or heavy metals (Ko, NEJM, 1998). These are findings about the products sampled, not about every product.

What a buyer can check is limited: the Latin names and plant parts on the label, a Supplement Facts panel with amounts, and a third-party heavy-metal test result from the brand. The NCCIH advises asking any practitioner about training and experience. Are Chinese herbal supplements safe? goes through the surveys and case reports.

The catalog entries behind this guide

traditional Health Concerns Six Gentlemen A modified Xiang Sha Liu Jun Zi Tang of eight Chinese herbs in a vegetable capsule, taken two at a time between meals for weak digestion with gas, bloating and loose stools. Buy it at Amazon$1.99 a day
traditional Health Concerns Quiet Digestion A modified Bao He Wan formula of 13 Chinese herbs plus coral calcium in a vegetable capsule, taken two at a time between meals for fullness, gas and nausea after eating. Buy it at Amazon$2.39 a day
traditional Snap Dynasty Stomach Chi An 11-herb Chinese blend built on the Liu Jun Zi herbs (pinellia, poria, ginseng, atractylodes and others) in a gelatin capsule, taken two at a time up to three times a day. Buy it at Amazon$1.50 a day

Common questions

How old is traditional Chinese medicine?

Its classical texts are dated by scholars to the Warring States and Han periods: the Huangdi Neijing from roughly the first centuries BCE, the Shennong Bencao Jing to the first and second centuries CE, and Zhang Zhongjing’s Shang Han Lun to before 220 CE. Each was edited over later centuries, and the Neijing’s standard text goes back to an imperial edition of 1053.

Is “TCM” the same as Chinese medicine in general?

Not exactly. “Traditional Chinese medicine” names the version standardized in the People’s Republic from the 1950s, and the English phrase dates to the same decade. Japanese Kampo and Korean medicine grew from the same classical sources and have their own formulas and rules.

What does TCM say about digestion?

It describes digestion as the work of the spleen and stomach, with the spleen said to transform and transport food and fluids. When spleen qi is weak, the texts say dampness and stagnation follow. Treatment starts from a pattern such as spleen qi deficiency, food stagnation or liver qi overacting on the spleen, and diet and a formula are chosen to fit it.

What is a TCM pattern?

A pattern (zheng) is the group of findings a practitioner reaches from questions, the tongue and the pulse, and it decides the formula. ICD-11’s traditional medicine chapter lists 150 disorders and 196 patterns. A pattern is the tradition’s category and is not a laboratory diagnosis.

Does traditional Chinese medicine help irritable bowel syndrome?

A Cochrane review of 75 trials with 7,957 participants found some formulas improved symptoms against placebo, but only three trials were of high quality. An Australian trial of 116 people found symptom scores better on active Chinese herbal formulas than placebo over 16 weeks, with individualized formulas no better than a standard one. Does Chinese herbal medicine work for IBS? has the detail.

Is TCM licensed in the United States?

Acupuncture is regulated in most states and the District of Columbia, and most require NCCAOM certification, according to the NCCIH. Chinese herbal products are sold as dietary supplements. Chinese herbal medicine in the United States and Europe covers the rules.

Do Chinese herbal products contain heavy metals or undeclared drugs?

Some have. The NCCIH lists arsenic, lead and cadmium, undeclared drugs such as warfarin and diclofenac, and wrong herbs, and a California survey found 83 of 260 patent medicines (32%) with undeclared drugs or heavy metals. The surveys describe the products sampled and do not extend to every product.

Sources

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