The causes of liver function abnormalities are several categories: 1, viral hepatitis: caused by hepatophilic virus infection, such as hepatitis A, hepatitis B, hepatitis C, hepatitis E, can detect serum viral antibodies or viral nucleic acid DNA or RNA to clarify the diagnosis; 2, non-alcoholic steatohepatitis: fatty liver is very common in recent years, liver function can also be impaired, in addition to viral hepatitis, if the patient has high blood lipids 3.Alcoholic hepatitis: except for viral hepatitis, if the patient has a history of long-term heavy drinking, the elevated liver function GGT and alkaline phosphatase have a certain suggestive effect; 4.Autoimmune liver disease: except for viral hepatitis, no history of alcohol consumption, and no fatty liver, immunoglobulin and autoimmune liver Antibody profile to diagnose; 5, infectious toxic hepatitis: all bacterial and viral infections (non-hepatophilic viruses, such as cytomegalovirus, EBV, measles virus, etc.) can cause abnormal liver function; 6, gallbladder stones, bile duct stones leading to biliary tract infection, causing obstructive jaundice, dominated by elevated direct bilirubin, elevated liver function GGT and alkaline phosphatase; 7, congenital jaundice, hereditary liver disease; 8 , hemolytic jaundice, caused by hemolysis of red blood cells, with anemic manifestations, can be checked for hemolytic antibodies.