Traditional Chinese Medicine: History, Core Ideas and What the Evidence Shows
Traditional Chinese medicine (TCM) is one of the world’s oldest continuous healing traditions. Pieces of it now appear in clinics, gyms and pharmacies everywhere. This article explains where TCM came from and how its ideas about qi, yin-yang and the five phases fit together. It also covers what research says about acupuncture, tai chi and Chinese herbs. You will also learn the safety questions to ask before trying any of them.
This article is for information only and is not medical advice. Talk to a doctor before using any remedy, especially for a diagnosed condition, during pregnancy or for a child.
What is traditional Chinese medicine?
The US National Center for Complementary and Integrative Health (NCCIH) describes TCM as a system that has developed over thousands of years. Its practitioners use physical and mental practices such as acupuncture and tai chi, together with herbal products. Encyclopaedia Britannica describes its aim as preventing or healing illness by restoring balance between yin and yang. It dates the tradition to at least 23 centuries ago.
TCM is not one single therapy. It is a family of practices that share a common theory of the body. Some of those practices have been studied in good-quality trials. Others rest almost entirely on tradition. Keeping the two apart is the most useful thing a curious reader can do.
It also helps to know that the name is fairly modern. The tradition grew over many centuries and many regional schools. Much of what is taught as “TCM” today was systematized in China in the mid-20th century. Classical ideas were then organized into standard textbooks and state colleges.
A short history of traditional Chinese medicine
Chinese medical tradition traces itself to legendary figures and to a small number of classic texts. The table below lists the works most often cited as its foundations. Dates for the earliest texts are approximate, because many were compiled over generations and credited to mythical authors.
| Text or figure | Approximate period | Why it matters to the tradition |
|---|---|---|
| Huangdi Neijing (Inner Classic of the Yellow Emperor) | Compiled during the Han dynasty, roughly the last centuries BCE | Sets out yin-yang, the five phases, qi and the channels as a theory of the body |
| Shennong Bencaojing (Divine Farmer’s Materia Medica) | Han dynasty, credited to the legendary Shennong | The earliest major catalogue of medicinal substances |
| Zhang Zhongjing, Shanghan Lun (Treatise on Cold Damage) | Around 200 CE | Organized fevers into stages and paired them with herbal formulas still taught today |
| Ge Hong, Handbook of Prescriptions for Emergencies | 4th century CE | Described soaking sweet wormwood (qinghao) for fevers, later important to modern research |
| Li Shizhen, Bencao Gangmu (Compendium of Materia Medica) | Completed in 1578 | Britannica notes it covers 1,892 drugs and about 11,000 prescriptions |
| Modern standardization | Mid-20th century | Classical ideas were organized into the textbook “TCM” taught today |
The artemisinin story: tradition as a research lead
The best-known bridge between TCM and modern science runs through a single herb. In the 1970s, the Chinese pharmacologist Tu Youyou searched classical texts for fever treatments. Ge Hong’s handbook described soaking qinghao in cold water rather than boiling it.
That detail helped her team extract the active compound at a lower temperature. The result was artemisinin, which became the basis of today’s frontline malaria drugs. Tu shared the 2015 Nobel Prize in Physiology or Medicine for the discovery.
The lesson cuts both ways. A classical text pointed to a real compound. Yet the drug’s value was proven only through purification, chemistry and clinical trials. Drinking qinghao tea is not the same as taking a standardized malaria medicine, and no one should try to treat malaria with herbs.
Core ideas of traditional Chinese medicine
TCM theory uses a handful of ideas to describe health, illness and treatment. They are best understood as a philosophical framework, not as anatomy. Modern science has not found physical structures that match qi or the meridians.
Qi: the vital force
In TCM belief, qi (pronounced “chee”) is the vital energy that animates the body. It is thought to flow through a network of channels called meridians. Illness, in this view, comes from qi that is weak, blocked or out of balance. Our article on qi and the meridians covers the channels in more detail.
Yin and yang: complementary opposites
Yin and yang describe paired qualities that depend on each other. Yin is linked with cool, still, dark and inward. Yang is linked with warm, active, bright and outward. TCM teaches that health is a dynamic balance between the two, rather than a fixed state. You can read more in our piece on yin and yang philosophy.
The five phases (wu xing)
The five phases are often translated as “five elements,” but “phases” fits better. They describe stages of change rather than substances. Each phase is linked to organs, seasons, colors, emotions and directions, as the chart shows.
| Phase | Paired organs (TCM) | Season | Color | Emotion | Direction |
|---|---|---|---|---|---|
| Wood | Liver, gallbladder | Spring | Green | Anger | East |
| Fire | Heart, small intestine | Summer | Red | Joy | South |
| Earth | Spleen, stomach | Late summer | Yellow | Worry, overthinking | Center |
| Metal | Lung, large intestine | Autumn | White | Grief | West |
| Water | Kidney, bladder | Winter | Black | Fear | North |
These pairings are traditional correspondences. In TCM, an “organ” such as the spleen refers to a set of functions, not to the anatomical organ alone.
The phases also relate to one another in two cycles. TCM teaches that each phase nourishes the next and restrains another. The diagram below shows both.
Generating cycle (each phase “feeds” the next)
Fire→
Earth→
Metal→
Water→ back to Wood
Controlling cycle (each phase “restrains” another)
Earthrestrains
Waterrestrains
Firerestrains
Metalrestrains Wood
A common teaching image: wood feeds fire, fire leaves ash (earth), earth yields metal, metal collects water, and water nourishes wood.
How a TCM practitioner assesses a patient
Classical TCM diagnosis rests on the “four examinations.” The practitioner looks, listens and smells, asks questions, and touches. Two techniques stand out: reading the tongue and feeling the pulse at both wrists, at three positions and depths.
The findings are then sorted using the “eight principles”: yin or yang, interior or exterior, cold or heat, and deficiency or excess. Instead of naming a disease, the practitioner describes a pattern, such as “qi deficiency” or “damp heat.” Two people with the same Western diagnosis can receive different treatment.
- Tongue color, coating and shape
- Pulse quality at both wrists
- Sleep, appetite, thirst, temperature preferences
- Emotional state and season
- Result: a named pattern of imbalance
- History and physical examination
- Blood tests, imaging or other tests as needed
- A specific diagnosis
- Treatment with tested benefits and risks
- Result: a diagnosis that can be confirmed or ruled out
The two approaches answer different questions. A TCM pattern cannot rule out conditions such as infection, diabetes or cancer. That is why NCCIH advises against using TCM to replace or delay conventional care.
Traditional Chinese medicine practices and what the evidence shows
Each TCM practice has its own research record. The summary below draws on NCCIH’s reviews of the evidence.
| Practice | What it involves | What research shows | Evidence strength |
|---|---|---|---|
| Acupuncture | Thin needles at specific points | May help some chronic pain conditions; no help for others | Moderate for some pain |
| Tai chi | Slow, flowing movement with breathing | May reduce falls and help knee osteoarthritis, back pain, fibromyalgia | Low to high, by condition |
| Qigong | Gentle movement, posture and breath | Often studied together with tai chi; results similar but less studied | Limited |
| Chinese herbal products | Formulas of plant, mineral or animal materials | Many studies are poor quality, so no firm conclusions | Weak; real safety risks |
| Cupping | Suction cups on the skin | May reduce pain, but research is mostly low quality | Weak |
Acupuncture: where it helps and where it doesn’t
Acupuncture is the most studied part of TCM. NCCIH reports it may help chronic low-back and neck pain, performing better than sham acupuncture and comparably to anti-inflammatory drugs. A 2017 American College of Physicians guideline recommends it for chronic low-back pain, based on moderate-quality evidence.
Moderate-quality evidence also supports it for knee osteoarthritis and for reducing how often migraines occur, though the advantage over sham is small. Some benefit is seen after surgery, with less pain and less opioid use.
The list of conditions where it does not seem to help is just as useful. NCCIH reports no benefit over sham for irritable bowel syndrome or carpal tunnel syndrome. It did not improve IVF pregnancy rates, long-term smoking cessation or lung function in asthma.
One finding shapes how scientists read all of this. In many trials, real acupuncture beats no treatment by a wider margin than it beats sham needling. That suggests part of the benefit comes from expectation and the treatment ritual, not from the specific points.
Tai chi and qigong: gentle movement with real support
Tai chi has some of the best evidence among TCM practices. A 2019 review cited by NCCIH found high-certainty evidence that it reduces the share of older adults who fall, by about 20%. Other balance exercises worked as well or better, so tai chi is one good option among several.
The American College of Rheumatology and the Arthritis Foundation strongly recommend tai chi for knee osteoarthritis. Reviews also suggest benefits for low-back pain and fibromyalgia, and for balance in Parkinson’s disease, with lower-certainty evidence. Our article on tai chi covers its history and forms.
Tai chi is generally safe. A 2019 review found side effects were minor, such as muscle aches, and similar to other exercise. Instructors are not licensed, so ask about their training. Pregnant women should check with a provider first.
Chinese herbal medicine: weak evidence, real risks
Chinese herbs have been studied for stroke, heart disease, mental health and respiratory infections. NCCIH reports that many of those studies are of poor quality, so firm conclusions cannot be drawn. This is the area of TCM where safety deserves the most attention.
Cupping, moxibustion and tui na
Cupping uses glass, bamboo or silicone cups to create suction on the skin, leaving round marks. NCCIH says it may reduce pain, but most research is low quality. Moxibustion burns dried mugwort near the skin, and tui na is a form of therapeutic massage. Both have far less research behind them.
Common TCM herbs: tradition and what research says
Many TCM herbs are now sold as single supplements. The table separates how each is described in tradition from what Tier 1 sources say. It gives no doses.
| Herb | In TCM tradition | What research shows | Key cautions |
|---|---|---|---|
| Asian ginseng (Panax ginseng) | A tonic said to strengthen qi | Mostly small, short trials; larger studies needed (NCCIH) | Insomnia is the most common side effect. May lower blood sugar and affect clotting. Possibly unsafe in pregnancy; some experts advise against use in children. |
| Licorice root (gan cao) | Said to harmonize the other herbs in a formula | Not enough good evidence for any condition (NCCIH) | Glycyrrhizin can cause irregular heartbeat, especially with high blood pressure or heart or kidney disease. Large amounts are unsafe in pregnancy. Interacts with corticosteroids. |
| Goji berry (gou qi zi) | Said to nourish the liver and eyes | Little high-quality human research | May interact with warfarin. Ask a pharmacist if you take blood thinners. |
| Ma huang (ephedra) | Used for colds, coughing and wheezing | Linked to heart attack, stroke, seizures and psychosis (NCCIH) | The FDA banned ephedra dietary supplements in 2004. Unsafe in pregnancy, breastfeeding and children. |
Safety of Chinese herbal products: what to know
NCCIH warns that some Chinese herbal products have been contaminated. Problems found include undeclared prescription drugs such as warfarin and diclofenac, and heavy metals such as arsenic, lead and cadmium. Pesticides and sulfites have also been found. In other cases, the wrong herb was used by mistake, causing serious harm.
The aristolochic acid warning
The clearest example is aristolochic acid. It occurs in Aristolochia plants, sometimes called birthwort, and some Asarum plants. The US National Cancer Institute links it to kidney damage and to cancers of the bladder and upper urinary tract.
Harvard Health describes how this came to light in Belgium in the early 1990s. A weight-loss clinic’s herbal remedy was meant to contain Stephania tetrandra. Aristolochia fangchi, a plant with a similar Chinese name, appears to have been substituted. Forty-three patients developed end-stage kidney failure, and many later developed urinary tract cancers.
The episode shows why a label is not a guarantee. Herbs with similar names can be confused, and a mix-up can be devastating. Never buy herbal products that list Aristolochia, guang fang ji or birthwort.
Acupuncture and cupping safety
Serious acupuncture complications are uncommon. NCCIH notes they can occur with nonsterile needles or poor technique, including infections, a punctured lung and nerve injury. The FDA requires acupuncture needles to be sterile and labeled for single use, and most US states license acupuncturists.
Cupping can cause burns, skin infections, lasting discoloration and scarring. It may worsen eczema or psoriasis. Equipment that is shared without sterilizing can spread hepatitis B and C.
- Are pregnant, breastfeeding or trying to conceive
- Are considering TCM for a child
- Take blood thinners, diabetes or blood pressure medicine, or steroids
- Have heart, kidney or liver disease, or high blood pressure
- Have a bleeding disorder or a weakened immune system (relevant for needles and cupping)
- Have a diagnosed condition you are treating with prescribed medicine
Tell every provider about every herb, supplement and practice you use.
How traditional Chinese medicine is practiced and regulated
Who you see matters as much as what they offer. In the United States, NCCIH notes that most states and Washington, DC, regulate acupuncture. Most require certification from the National Certification Commission for Acupuncture and Oriental Medicine (NCCAOM). Ask any practitioner which license and certification they hold.
Herbal products are a different story. In the US, they are usually sold as dietary supplements. The FDA does not review supplements for safety or effectiveness before they reach shelves. It can act only after a product is shown to be harmful, as it did with ephedra in 2004.
That gap is why the questions you ask matter. A careful practitioner will want to know your diagnoses and medicines. They should tell you what is in any formula, and suggest you check with your doctor.
When TCM practices make sense, and when they don’t
Reading the evidence together suggests a practical way to sort TCM practices. Movement practices and, for some pain conditions, acupuncture are reasonable additions to medical care. Herbal products need far more caution.
Tai chi or qigong for balance, fitness and gentle movement. Acupuncture from a licensed practitioner, alongside medical care, for chronic back, neck or knee pain.
Any herbal product, especially if you take medicine. Cupping if you have skin conditions, bleeding problems or take blood thinners.
Using TCM instead of diagnosis or treatment for a serious illness. Products containing ephedra or aristolochic acid. Unlabeled herbs from unknown sources.
Common mistakes people make with TCM
- Assuming “traditional” means tested. Long use does not prove safety or benefit. Aristolochia was used for centuries before its harms were recognized.
- Treating a TCM pattern as a diagnosis. A pulse and tongue reading cannot rule out infection, diabetes or cancer.
- Mixing herbs with medicines without telling anyone. Licorice, ginseng and goji can all interact with common drugs.
- Buying herbs online from unknown sellers. NCCIH warns about contamination with heavy metals and undeclared drugs.
- Skipping the practitioner check. Ask any acupuncturist about their license and whether they use sterile, single-use needles.
- Expecting acupuncture to help everything. The evidence supports it for some pain conditions, not for IBS, IVF or quitting smoking.
TCM alongside other traditions
TCM shares some ideas with other systems. India’s Ayurveda also describes the body through balanced qualities and life-force, in its case through the doshas and prana. Our article on Ayurveda compares its core ideas. Like TCM, Ayurvedic herbal products carry contamination risks and need the same caution.
Movement practices travel best between traditions. Tai chi, qigong and yoga all combine posture, breath and attention. Their research records are similar, with benefits for balance, flexibility and well-being. Browse our yoga and breath articles for practices you can start at home.
One way to start safely
If TCM interests you, begin with movement, not herbs. Find a beginner tai chi or qigong class, check the instructor’s experience, and try it for a few weeks. It carries the least risk and some of the best evidence of any TCM practice.
Free download
TCM Five Phases Chart and Safety Checklist (PDF)
One printable page: the five phases correspondence chart and both cycles, plus questions to ask before acupuncture, cupping or any herbal product. No treatments and no doses.
This article describes traditions, beliefs, history and research for educational purposes. It is not a guide to action and not an instruction to treat any illness. If you have a health concern, please see a doctor or qualified healthcare professional first, and never delay or stop medical treatment because of anything you read here.
Sources
- National Center for Complementary and Integrative Health. Traditional Chinese Medicine: What You Need To Know. nccih.nih.gov
- National Center for Complementary and Integrative Health. Acupuncture: What You Need To Know. nccih.nih.gov
- National Center for Complementary and Integrative Health. Tai Chi: What You Need To Know. nccih.nih.gov
- National Center for Complementary and Integrative Health. Cupping. nccih.nih.gov/health/cupping
- National Center for Complementary and Integrative Health. Asian Ginseng. nccih.nih.gov/health/asian-ginseng
- National Center for Complementary and Integrative Health. Licorice Root. nccih.nih.gov/health/licorice-root
- National Center for Complementary and Integrative Health. Ephedra. nccih.nih.gov/health/ephedra
- National Cancer Institute. Aristolochic Acids. cancer.gov
- Harvard Health Publishing. Caution always key in using herbal medicines. health.harvard.edu
- Encyclopaedia Britannica. Traditional Chinese medicine; and Li Shizhen. britannica.com
- Huang J. Taoist Medical Texts, Drug Discovery, and Pandemics. Asia Research Institute, National University of Singapore. ari.nus.edu.sg
- Nobel Prize in Physiology or Medicine 2015: Tu Youyou. nobelprize.org
