Jaundice may be caused by overproduction of bilirubin, liver injury, biliary obstruction, etc.,. 1. Excessive bilirubin production: Jaundice is caused by excessive production of bilirubin, which is mainly caused by hemolysis, red blood cell disorders and other blood system diseases. It may lead to hemolysis, which can lead to jaundice. 2. Liver injury: Jaundice may be caused by liver injury, such as viral hepatitis, fatty liver, etc. Bilirubin is a metabolite produced by human metabolism, which is mainly metabolized by the liver. If liver injury affects the bilirubin metabolism function and causes bilirubin metabolism disorder, leading to elevated bilirubin level in the body, jaundice will occur. 3. Biliary obstruction: Jaundice may be caused by biliary obstruction. Normal bilirubin is discharged through the bile duct to the intestines and outside the body. If the bile duct is obstructed, bilirubin will enter the bloodstream due to the obstruction of the excretion, thus increasing the bilirubin in the blood and jaundice will occur. If jaundice occurs, patients are advised to go to the hospital for examination and treatment in time to avoid serious conditions.