TCM Constitutional Types: Identifying Your Patient's Body Type

Constitution (tǐ zhì, 体质) is the relatively stable physical, physiological and psychological make-up a person carries through life. It's shaped by inherited Jing, in-utero conditions, early-life environment and decades of habit. Pattern (zhèng) describes what's happening this month; constitution describes who the patient is. The same pattern in two different constitutions will respond differently to the same treatment, which is exactly why constitutional diagnosis matters.

The modern standard, codified by Professor Wang Qi at Beijing University of Chinese Medicine, recognises nine constitutional types: one balanced (Ping He) and eight imbalanced — Qi Deficiency, Yang Deficiency, Yin Deficiency, Phlegm-Damp, Damp-Heat, Blood Stasis, Qi Stagnation, and Special (allergic) constitution. The classification is operationalised through the Constitution in Chinese Medicine Questionnaire (CCMQ), which has been validated in large Chinese-population studies and translated for international use.

Pattern is short-term and dynamic — it's the snapshot of disharmony you're treating today. Constitution is long-term and stable — it's the soil the pattern grew in. A patient with a Phlegm-Damp constitution will keep generating Phlegm-Damp patterns until you address the constitutional terrain, no matter how many times you clear the acute presentation. Treating pattern alone is firefighting. Treating constitution is changing the building.

Constitution is stable but not fixed. The framework distinguishes between core constitutional tendency (which mostly tracks Jing and is hard to shift) and constitutional state (which responds to diet, sleep, exercise, climate, and treatment over months to years). A 30-year-old with Yang Deficiency who moves to a tropical climate, sleeps well and stops eating ice for ten years won't suddenly become Ping He — but the expression will quiet down considerably. Constitutional treatment is slow, cumulative work.