1. How Chinese medicine reasons

Ten people walk in with the same Western diagnosis and Chinese medicine may find six different patterns among them. That is not vagueness, it is the whole method. The classical framing is 同病异治 — same disease, different treatment — and its mirror 异病同治, different diseases treated alike when the pattern underneath is the same.

So the working unit of TCM is not the disease name but the pattern: a description of function, made from signs the practitioner can actually observe — what the tongue looks like, what the pulse does under three fingers, when symptoms worsen, what makes them better, how the person sleeps and digests and feels the cold.

Every pattern statement answers a small set of questions, and the rest of this book is really just those questions in detail.

• ·Where is it? A channel, an organ system, an anatomical region, a level of depth.
• ·What is it made of? Qì, Blood, Yīn, Yáng, Fluids — deficient, stagnant, or in excess.
• ·What is the pathogenic factor? Cold, Heat, Damp, Phlegm, Wind, Dryness, Blood stasis, or none at all.
• ·How deep and how long? Exterior or interior, acute or chronic, root (běn) or branch (biāo).

Medi-Chi is built as clinical decision support for practitioners who work inside a regulated health system. That means the Western diagnosis is never discarded — it sets the safety boundary. Red flags, referral thresholds and known pathology come first; the pattern work happens within that boundary, not instead of it.

In practice a good integrative note carries both readings: the Western picture with its investigations, and the TCM pattern with the reasoning that produced it. When the two disagree, the disagreement itself is information.