Pattern Diagnosis 辨证

The method itself

Western medicine asks what disease is this? The tradition asks what pattern is this person showing? — and that difference is the whole engine. A pattern (zheng, 证) is the total configuration: the complaint, yes, but also complexion, temperature preferences, digestion, sleep, emotional weather, and the two famous proxies — the look of the tongue and the feel of the pulse — assembled through the "four examinations" of looking, listening-smelling, asking, and touching^[1]. Treatment addresses the pattern. Hence the tradition's proudest slogan: same disease, different treatments; different diseases, same treatment^[1].

The eight principles

The sorting starts coarse: is the pattern interior or exterior, cold or hot, deficient or excess, yin or yang?^[1] Those eight gates — yin-yang applied clinically — split further into the organ-and-substance patterns this site's pages name constantly: spleen qi deficiency (Si Jun Zi Tang's territory), liver qi constraint (Xiao Yao San's), kidney yin deficiency (Liu Wei Di Huang Wan's). Every formula page's "pattern it treats" section is this method in action.

Why it matters for reading this site

Because it is the answer to the reasonable question "does herb X treat condition Y?" The tradition's honest reply is usually: it treats pattern Z, which some people with condition Y show. That's also why casually matching a supplement to a diagnosis misses how the system was designed to work — and why the pages here keep saying pattern matters before their safety sections.

An honest note

Pattern diagnosis is a clinical art with real internal logic and imperfect reproducibility — two practitioners can read one patient differently, a known challenge for research design^[1]. Modern trials increasingly account for it by enrolling patients pattern-first. Whether patterns carve nature at its joints, they demonstrably organize centuries of bedside observation into something teachable — which is what a medical tradition needs its diagnostics to do.

Reviewed 2026-08-25