1, viral hepatitis: viral hepatitis is an inflammatory disease caused by hepatitis A virus, hepatitis B virus, hepatitis C virus, hepatitis D virus, hepatitis E virus caused by liver cell damage, hepatitis B, hepatitis C can form chronic, long-term chronic liver damage can eventually develop into cirrhosis, liver cancer and other serious consequences. Hepatitis B is currently the most harmful to health and the most widely spread infectious disease in China. 2, alcoholic liver (alcoholic liver disease): a broad sense of alcoholic liver refers to all kinds of liver diseases caused by alcoholic factors. The general clinical reference to alcoholic liver refers to alcoholic fatty liver, which has a very high incidence in clinical practice and is extremely harmful, second only to hepatitis B in terms of liver disease. 3, fatty liver (moderate to severe fatty liver): fatty liver is a lesion caused by various factors that increase the content of lipids in the liver, resulting in the destruction of the normal tissue structure of the liver, especially moderate to severe fatty liver is the most serious damage to the liver. 4, liver fibrosis and cirrhosis: cirrhosis is a slow progressive, diffuse liver lesion caused by various causes of long-term repeated damage to liver cells, resulting in liver cell necrosis. Liver fibrosis is the early stage of liver cirrhosis. 5.Hepatocellular carcinoma (primary liver cancer): primary liver cancer is mainly due to chronic hepatitis, cirrhosis, alcoholic liver, fatty liver and other liver diseases resulting in lesions. Autoimmune hepatitis: Autoimmune hepatitis is different from viral hepatitis, which is related to autoimmune reaction. Most of them occur in young women, the clinical manifestations are similar to chronic hepatitis, some symptoms are quite like systemic lupus erythematosus, so it is often called lupus-like hepatitis. Autoimmune hepatitis is easily recurrent. 7, drug hepatitis drug liver disease diagnosis can be based on the history of drug use, clinical symptoms, blood picture, liver function tests, liver biopsy and the effect of drug withdrawal to make a comprehensive diagnosis. Before diagnosing drug-related hepatitis, we should know: ① drug history: the drugs taken within 3 months before the onset of the disease, including the dose, route of administration, duration and other drugs used at the same time. ②History of liver disease: the presence of viral hepatitis and other causes of liver disease. ③History of drug allergy or allergic disease.