Hepatitis is categorized as viral, alcoholic, autoimmune, and drug-induced. Judgment methods are pathogenic examination, history of alcohol consumption, history of drug taking, autoantibody test, etc. 1. Viral hepatitis: it is categorized into hepatitis A, B, C, D, and E. The relevant pathogen examination, such as hepatitis B penta, hepatitis C antibody, hepatitis A antibody, etc., can confirm the diagnosis according to the examination results. 2. Alcoholic hepatitis: there is a clear history of alcohol consumption, liver function test suggests abnormal aminotransferases, abdominal CT or ultrasound suggests liver damage, and the diagnosis can be made by excluding other causes of hepatitis. 3. Autoimmune hepatitis: autoantibody examination should be perfected, such as anti-nuclear antibody, anti-neutrophil cytoplasmic antibody, anti-smooth muscle antibody, etc., or liver puncture biopsy. 4. Drug hepatitis: there is a history of drug taking, liver function abnormality, liver function can be recovered after stopping drug for a period of time or after treatment. No matter what kind of hepatitis, there may be intrahepatic or extrahepatic manifestations, liver function tests suggest elevated aminotransferases, and liver damage can be detected by imaging tests, but liver biopsy is the gold standard for diagnosis (which is an invasive operation and is seldom used). Early detection, early clarification of the condition, early treatment in the hospital.