THEORY
The Eight Principles: The Grid Behind Every TCM Diagnosis
The eight principles are the diagnostic grid: yin or yang, cold or heat, deficiency or excess, interior or exterior. Four binary questions that locate a complaint before any herb is named. They sound abstract until you watch them work: interior excess heat and exterior deficiency cold lead to completely different clinics, and the grid is how a practitioner decides which one you are standing in.
Why it matters in practice
A reader who understands this concept can follow almost any TCM discussion, including the articles on this site, without feeling like a guest at someone else's conversation.
Start low, watch how your body responds, and give it a fair run of a few weeks before judging. If something feels wrong, stop; that feedback matters more than any article.
Sources and further reading
We cite classical materia medica and modern reference works. This article is health education, not medical advice.
- Shennong Bencao Jing (The Divine Farmer's Materia Medica), Han dynasty.
- Bencao Gangmu (Compendium of Materia Medica), Li Shizhen, 1578.
- Chinese Pharmacopoeia, current edition — identity, quality and safety monographs.
- NCCIH and WHO reference material on traditional medicine safety.
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