First Principles 基础
The Five Phases 五行
“Wood, fire, earth, metal, water — not five ingredients, five movements. "Elements" was always a mistranslation; nothing here sits still.”
— Lao Xinglin
Movements, not elements
The old translation "five elements" suggests Greek-style building blocks, and that misreading has confused readers for a century. Xing means to move, to go — these are five phases of change, drawn from watching the world work[2]. Wood is expansion: spring, sprouting, pushing upward. Fire is culmination: summer, flourishing, the peak. Earth is the pivot: ripening, centering, transformation. Metal is contraction: autumn, drawing inward, letting fall. Water is storage: winter, depth, potential gathering for the next push. Any cycle — a year, a day, a life, a digestion — can be read through them.
The two cycles
The phases relate in two famous loops. The generating cycle (相生): wood feeds fire, fire makes earth (ash), earth bears metal, metal enriches water (the old image of condensation), water feeds wood — each phase the mother of the next. The controlling cycle (相克): wood breaks earth, earth dams water, water quenches fire, fire melts metal, metal cuts wood — each phase checking another so no movement runs away with the system[1]. Health, in this picture, is cycles in balance; disease is a phase overacting or failing its neighbors.
What medicine does with it
Each phase anchors a web of correspondences: wood to the liver, its season spring, its emotion anger, its flavor sour; fire to the heart and joy; earth to the spleen and worry; metal to the lung and grief; water to the kidney and fear[1]. Clinically the cycles become grammar: a "liver overacting on spleen" pattern (wood breaking earth too hard) is stress wrecking digestion — exactly what Xiao Yao San was written for; "metal failing to enrich water" links chronic lung weakness to kidney depletion. As with yin and yang, the system is best held as a clinical language for relationships — a way of asking what is pushing on what — rather than a physics to defend[2].
Where to next
The phases organize the body's landscape; the meridians map its roads. Read together, the herb pages' talk of "entering the liver channel" starts making sense.
References
Reviewed 2026-08-25