First Principles 基础
What Is Qi? 气
“The most argued-over word in the tradition. Come, sit — we'll take it slowly, without incense and without eye-rolling.”
— Lao Xinglin
The word itself
The character 气 began as a picture of vapor rising — steam, breath, mist over a rice field. From that root the tradition built its central working concept: qi as the animating activity of a living thing — everything in you that moves, warms, transforms, and defends[1]. Not a substance you could bottle; closer to a verb wearing a noun's clothing. When classical texts say qi flows, they are describing function the way we might say "the current" or "the metabolism" — a summary word for processes too entangled to name one by one[2].
The kinds worth knowing
The tradition subdivides generously, but four cover most conversations:
- Ying qi (营气) — the nourishing activity extracted from food,
circulating with the blood.
- Wei qi (卫气) — the defensive activity at the surface; what
huang qi is said to strengthen when you catch every passing cold.
- Zong qi (宗气) — the gathering activity of breath and heartbeat in
the chest.
- Yuan qi (元气) — the original endowment, the constitution you were
issued at the door[1].
The two classic problems
Most qi language in a clinic reduces to two patterns. Deficiency (气虚): not enough activity — fatigue, weak digestion, breathlessness, the picture tonics like ren shen address. Stagnation (气滞): activity that is stuck — tension, distension, sighing, moods that knot, the picture Xiao Yao San was written for. Notice that neither requires any exotic physics to be a useful clinical description; they are patterns a careful observer can see.
An honest note on the science
No instrument has measured qi, and this site will not pretend otherwise. The defensible claim is smaller and more interesting: qi is the tradition's organizing model — a pre-modern systems language for physiology — and some interventions built with that model (certain herbs, formulas, acupuncture for certain conditions) have since earned their own evidence, which we cite where it exists[2]. Keep the model and the evidence in separate pockets, and you can enjoy both without cheating either.
References
Reviewed 2026-08-25