Fish Border / Yu Ji
Version 1.0.0 · Updated 2026-07-30
CORE DEFINITION
The muscular eminence at the base of the thumb (thenar eminence). It is a diagnostic area for collateral vessels.
SCAFFOLDING EFFECT
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A display for stomach qi. If the thenar eminence is bluish-black, it indicates stomach cold; if red, stomach heat. A glance at the color of the thenar eminence reveals the current temperature in the stomach.
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'Fish Border' refers to the thenar eminence on the thumb side of the palm, as well as the 'Yuji point' on the Lung Meridian of Hand-Taiyin. In traditional Chinese medicine, it is associated with the lung and body fluids, and is a common site for inspection (color, temperature, and fullness of the thenar eminence) and acupuncture.
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Source support: Explicit
- zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E9%AD%9A%E9%9A%9B%E7%A9%B4verified
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