The clinical manifestations of viral hepatitis are complex, so it is important not to make a diagnosis subjectively and unilaterally by relying only on one or one abnormal examination. Then the pathogenic diagnosis should be made according to the results of hepatitis virology test, and the final diagnosis should be confirmed. 1, acute hepatitis should be based on the epidemiological history, clinical symptoms, signs, laboratory and pathogenic test results to make a comprehensive judgment and exclude other diseases. Epidemiological history such as history of close contact and history of injection. History of close contact refers to those who eat, live or live with patients with confirmed viral hepatitis (especially in the acute phase) or who have frequent contact with hepatitis virus contaminants (such as blood and feces) or have sexual contact without taking protective measures. History of injection refers to having received blood transfusion, blood products and injection of medication without strictly sterilized apparatus, immunization and needle stick treatment within six months. (ii) Symptoms refer to symptoms that appeared recently and lasted for more than a few days but could not be explained by other causes, such as weakness, loss of appetite, nausea, etc. (iii) Signs refer to hepatomegaly with pressure pain and percussion pain in the liver area, and some patients may have mild splenomegaly. Laboratory tests mainly refer to elevated serum ALT. Positive pathogenetic test. Any person with positive laboratory test and two of the three positive epidemiological history, symptoms and signs or both laboratory test and physical signs (or laboratory test and symptoms), and exclude other diseases can be diagnosed as acute hepatitis without jaundice. 2, chronic hepatitis Acute hepatitis more than six months, or the original hepatitis B, C, D or HBsAg carrier history, and this time due to the same pathogen again hepatitis symptoms, signs and liver function abnormalities can be diagnosed as chronic hepatitis. If the date of onset is unknown or there is no history of hepatitis, but the histopathological examination of the liver is consistent with chronic hepatitis, or if the diagnosis is based on a comprehensive analysis of symptoms, signs, laboratory tests and ultrasound examination, the corresponding diagnosis can also be made.