Most of the yellow coloration of urine is physiological, and the main causes include low water intake, excessive sweating, and the effects of food. Excluding physiological factors, some diseases can also cause related symptoms, common causes include inflammation and liver and gallbladder diseases. 1. Physiological factors: (1) Low water intake: Low water intake will lead to increased water reabsorption in the urine, causing the urine to concentrate, which will further lead to the yellowing of the urine. (2) sweating: after strenuous exercise or overwork, it will lead to a large amount of sweat secretion, which further leads to the loss of water in the body, urine concentration, causing yellow urine. (3) food influence: after eating a lot of food containing yellow pigment, because it will not be absorbed, will also be accompanied by urine discharge, causing yellow urine. 2. Pathologic factors: (1) Inflammation: inflammation of the urinary system, resulting in damage to the surrounding mucous membrane exudation as well as increased inflammatory cells, can also cause the corresponding situation. (2) Hepatobiliary diseases: mainly hepatitis or biliary tract obstruction and other reasons lead to jaundice, which will cause an increase in the content of bilirubin in the urine, and further lead to the production of yellow urine. Yellow urine accompanied by obvious digestive system function abnormalities, pain in the liver area, you need to consult a doctor in time to observe and diagnose the condition and then standardize the treatment to avoid delays in the condition.