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What Is Qi? A Traditional Concept Explained

What qi (chi) means in traditional Chinese medicine, where the idea comes from, how it appears in acupuncture and qigong, and why it is not a measured biomedical quantity.

Content last updated . This page has not been medically reviewed.

A traditional concept, in the tradition's own terms

Qi (also spelled ch'i or chi) is one of the central ideas of traditional Chinese medicine (TCM). In English-language sources it is usually translated as vital energy, and illness is described as an imbalance of it. [1] The US National Center for Complementary and Integrative Health (NCCIH) describes qigong as using exercises to optimize energy within the body, mind and spirit. [2]

"Energy" here is a translation of a traditional term. None of the sources read for this page measures qi as energy in the physics sense, and this page does not treat it as a biomedical quantity. It is explained here as the tradition explains it, then compared with what research has actually measured.

Where the idea comes from

Qi appears in the early medical classics. A review of the Huangdi Neijing (Yellow Emperor's Inner Classic) says the text describes the circulation of blood (xue) and energy (qi) along main, collateral and other vessels, and links the five phases to organs, feelings, flavours and colours. [3] The same review dates the text to the period 475 to 225 BCE. [3]

A review of a book on the history of meridian theory describes how six meridians were developed in the Qin and Han dynasties on the basis of six types of qi. [4] In other words, qi is built into the traditional map of the body. It is not a separate add-on. Related ideas are covered in Qi, Blood and Body Fluids, Jing (Essence) and the Three Treasures and Wei Qi (Defensive Qi).

How qi appears in practice

  • In diagnosis. Practitioners describe patterns such as "qi deficiency" or "qi stagnation" as part of pattern differentiation. These are traditional descriptions of a person's situation, not laboratory diagnoses. See Common TCM Patterns Explained.
  • In acupuncture. Acupuncture has been used in some form for at least 2,500 years and originated in traditional Chinese medicine. [5] Reviews of the needle sensation known as deqi report that it is described as aching, tingling, numbness, heaviness, dull pain, throbbing and deep pressure, and that it is shaped by psychological state, previous experience and cultural background. [6] See What Is Acupuncture? for the modern evidence on whether acupuncture works for specific problems.
  • In qigong and tai chi. Qigong was developed in China as part of TCM and combines regulation of mind, breath, body movement and posture. [2] Tai chi is one of the hundreds of forms of qigong. [2] See Qigong and Tai Chi.

Frequently asked questions

What does qi mean?

In English-language sources qi is translated as vital energy, and illness is described as an imbalance of it. [1] It is a traditional concept, not a unit that biomedicine measures.

Is qi the same as electricity or a body signal?

No source read for this page shows that. A systematic review found the evidence did not conclusively support the claim that acupuncture points or meridians are electrically distinguishable. [11]

What is "deqi"?

Deqi is the needle sensation during acupuncture, commonly described as aching, tingling, numbness, heaviness or pressure. [6] Whether it predicts a better clinical result is not settled. [9]

Do I need to believe in qi for acupuncture or qigong to help?

Trials test whether a practice changes outcomes, not whether the theory is true. For qigong and pain, NCCIH describes the research as conflicting. [2] See Traditional Frameworks vs Biomedical Explanations.

Is qigong safe?

NCCIH says tai chi and qigong appear to be safe, and pregnant women should check with their health care providers first. [10]

More details: evidence, limits and cautions

The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.

What research has and has not found
Measuring qi itself: proper evidence not found. We checked NCCIH pages and PubMed reviews on acupuncture points, meridians and deqi. None showed a validated biomedical measurement of qi.

Researchers have proposed ways to connect the concept to biology. These are hypotheses, not findings:

  • One tissue study in vertebrates proposed that a network of cells called telocytes in connective tissue could be a structural analogue of meridians and could account for structural evidence for qi. [7] This is preclinical and a proposal, not an established link.
  • A paper on the body as an "electronic scheme" itself states there is no clear evidence that acupuncture points and meridians are separate organs or specific tissues. [8]

Deqi is something people feel and can report, so it can be studied. A systematic review found that ancient acupuncturists valued deqi as a diagnostic tool, prognosis predictor and necessary part of treatment, but that the current evidence is not solid enough to say whether deqi predicts clinical benefit. [9] Label: insufficient evidence.

For qigong, NCCIH says research on pain is conflicting: three small reviews suggested it may help, while a 2020 review of 5 studies (576 participants) found conflicting results for low-back and neck pain. [2] Qigong is a practice that can be tested in trials whatever one thinks about qi. Exercise practices like qigong are hard to blind, so expectation effects can affect results. For the wider question of how to judge such evidence, see Understanding Evidence.

Safety
Believing or not believing in qi has no bearing on safety. NCCIH says tai chi and qigong appear to be safe practices. [10] Women who are pregnant should talk with their health care providers before beginning tai chi, qigong or any other exercise program. [10] Do not delay care for new, severe or worsening symptoms because a traditional explanation sounds reassuring. NCCIH advises not using TCM to replace or delay seeking conventional care. [10]
References
  1. Beal MW. Acupuncture and acupressure: applications to women's reproductive health care. Journal of Nurse-Midwifery 1999. PubMed 10380442. Read 2026-10-22.
  2. NCCIH (US). Qigong: What You Need To Know. Read 2026-10-22.
  3. Cavalieri. Huangdi Neijing: a classic book of traditional Chinese medicine. Recenti Progressi in Medicina 1997. PubMed 9446158. Read 2026-10-22.
  4. Zhu. Evolution of meridian theory (book review). Zhongguo Zhen Jiu 2025. PubMed 40229165. Read 2026-10-22.
  5. NCCIH (US). Acupuncture: Effectiveness and Safety. Read 2026-10-22.
  6. Lin. Review of studies on Deqi of acupuncture mainly in foreign countries. Zhen Ci Yan Jiu 2013. PubMed 23819223. Read 2026-10-22.
  7. Yonghong et al. Telocytes in different organs of vertebrates: potential essence cells of the meridian in Chinese traditional medicine. Microscopy and Microanalysis 2020. PubMed 32390582. Read 2026-10-22.
  8. Strakhova. The body as an electronic scheme. Journal of Acupuncture and Meridian Studies 2024. PubMed 38898644. Read 2026-10-22.
  9. Zhang et al. Is deqi an indicator of clinical efficacy of acupuncture? A systematic review. Evidence-Based Complementary and Alternative Medicine 2013. PubMed 23983801. Read 2026-10-22.
  10. National Center for Complementary and Integrative Health (NCCIH, US). Traditional Chinese Medicine: What You Need To Know. Read 2026-10-22.
  11. Ahn AC et al. Electrical properties of acupuncture points and meridians: a systematic review. Bioelectromagnetics 2008. PubMed 18240287. Read 2026-10-22.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.