瘙痒可能在阻塞性黄疸（胆汁淤积）中首先出现，因为胆盐的贮留可能先于明显的胆红素贮留出现。
Pruritus may develop first in the course of obstructive jaundice (cholestasis) because retention of bile salts can occur before significant retention of bilirubin.
胆的主要生理功能是贮存和排泄胆汁。
The main physiological function of the gallbladder is to store and excrete bile.
此外，胆汁来源于肝，由肝之余气积聚输注于胆而成，胆汁经胆道排泄至小肠内，以助食物消化吸收。
Besides, the bile, accumulation of surplus liver-qi, comes from the liver and excretes into the small intestine to assist digestion.
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