MENTAL MODEL · M1438

Lung-Large Intestine Pair

SystemsHigh supportSystems Theory

Included

Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

The lung (zang/upper) and large intestine (fu/lower) are connected through meridians. When lung qi descends, the large intestine is unobstructed; when the large intestine is unobstructed, lung qi descends.

SCAFFOLDING EFFECT

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Piston effect. The lung is the plunger of a syringe, and the large intestine is the needle. If the plunger cannot be pushed down (constipation), it may be that the needle is blocked; if the needle does not produce water, it may be that the plunger is not exerting force (lung qi deficiency). To treat asthma (lung), often unblock the large intestine; to treat constipation, often raise lung qi.

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The lung and large intestine are connected by meridians and share qi movement: lung qi descending helps the large intestine transmit, and the large intestine being unobstructed helps lung qi descend. The exterior-interior and upper-lower form a 'piston' linkage, where stagnation in one affects the other.

MINIMUM ACTION

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Practice this model in one real situation:

To treat constipation, one can start by ventilating the lung (lifting the pot lid)
to treat cough and asthma, one can unblock the fu and purge heat
see upper (lung) disease, examine lower (intestine)
see lower disease, regulate upper
use 'lung qi descending then fu is unobstructed' as the treatment principle.

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Source support: Explicit

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baike.baidu.comhttps://baike.baidu.com/view/3874796.htmlZH · Explicit
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