High bile acids in a 3-year-old 5-month-old child may be related to physiological reasons such as eating, and may be related to hepatocellular damage such as acute hepatitis, biliary obstruction and other pathologic reasons. 1. Physiological reasons: when the child eats and draws blood to test serum bile acid, there may be a transient increase in the phenomenon, which is a normal phenomenon. 2. Pathologic causes: (1) Hepatocellular damage: when suffering from acute hepatitis, cirrhosis and other hepatocellular damage diseases, it can lead to abnormal bile acid metabolism, causing high bile acid. (2) Bile duct obstruction: such as intrahepatic and extrahepatic bile duct obstruction, which can lead to high bile acids. There may also be other causes for high bile acid in a 3 year old 5 month old child, such as genetic metabolic diseases, etc. It is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.