Hepatitis has 4 classifications: causative factor, virus type, duration of disease and jaundice. 1. Pathogenic factors: divided into viral, alcoholic, autoimmune, drug, steatohepatitis, etc. The main cause of hepatitis patients in China is viral hepatitis, so it is necessary to check Hepatitis B V or a certain kind of hepatitis antibody for etiologic diagnosis. 2. Virus type: it is divided into hepatitis A, B, C, D and E, of which hepatitis B is DNA virus and the other four are RNA virus. Hepatitis A and E are mainly transmitted through the digestive tract, while hepatitis B, C and D are mainly transmitted through blood and body fluids such as saliva. 3. Duration of the disease: acute hepatitis usually lasts less than 6 months, subacute severe hepatitis lasts between two weeks and half a year, and chronic hepatitis lasts more than 6 months. 4. With or without jaundice: it can be divided into acute jaundice hepatitis and acute jaundice-free hepatitis. Acute jaundice hepatitis has a more rapid onset, and it can be seen as chills, fever, hepatosplenomegaly and other manifestations. Acute jaundice-free hepatitis has a relatively slow onset and is usually characterized by weakness, pain in the liver area, nausea and vomiting. Hepatitis patients should pay attention to diet and life rules, and regularly go to the hospital for liver function, liver ultrasound, and hepatitis virus, blood routine and other related liver tests, in order to monitor the development of the disease in a timely manner.