Normal phenomenon: 1, drink less water or eat salty food, 2, get angry.
Pathological phenomena: 1, liver diseases (bile is mainly excreted from urine and intestine, if the liver is sick, then bile can't be excreted from intestine, bile can only be excreted from urine, and bile is yellow, so it is yellowish brown after discharge), 2, kidney diseases (urine can also be yellow when kidney qi is unstable or kidney deficiency occurs), 3, urinary system diseases (purulent urine can cause urine).