Chinese Medicine Theory and Diagnosis: Pattern Differentiation
Structure to reason with
Build answers from yin–yang, qi–blood–fluid, zangfu, and pathogenic factor frameworks. Diagnosis follows the four examinations - observation (including tongue), listening/smelling, inquiry (including the ten traditional questions), and palpation (including pulse). The exam rewards the ability to move from signs to pattern and from pattern to principle and method, not isolated symptom lists.
Traps to expect
- Mixed patterns - real cases are rarely single patterns; a question may describe deficiency with an underlying excess (deficiency root, excess branch) and expect treatment principle to reflect both.
- Tongue and pulse over-reading - one sign rarely decides a pattern; questions deliberately weight a single feature that must be interpreted alongside the whole picture.
- True versus false heat/cold - extreme heat can produce cold-like signs and vice versa; look for the determining features (pulse quality, thirst preference, urine, tongue body colour).
- Organ-relationship errors - liver–spleen, heart–kidney, lung–spleen interactions; know which direction of disharmony the signs support.
- Terminology precision - "qi stagnation" is not "qi deficiency"; "damp-heat" requires both damp and heat signs.
Worked example
A patient has fatigue, loose stools, poor appetite, and a pale swollen tongue with teeth marks, but also irritability and a wiry pulse. Rule of thumb: identify the root deficiency first, then the branch excess - here spleen qi deficiency with liver qi constraint. The treatment principle states both: strengthen the spleen and soothe the liver. When a question offers only one-sided principles, choose the option that addresses both the deficiency and the constraint; single-factor answers are typical distractors.