The types of hepatitis are as follows: 1. Hepatitis in the broad sense: refers to the presence of inflammatory changes in the liver, i.e., the presence of degeneration, necrosis and infiltration of inflammatory cells in hepatocytes, collectively referred to as hepatitis, such as viral hepatitis, drug-induced hepatitis, autoimmune hepatitis, alcoholic hepatitis, etc.; 2. Hepatitis in the narrow sense: refers to the clinically common infectious hepatitis caused by the entry of hepatophilic viruses into the human body, damaging the cells of the liver and leading to changes in liver function. In the narrow sense of hepatitis, those with clear etiology mainly include hepatitis A, hepatitis B, hepatitis C, hepatitis D, and hepatitis E. Among them, hepatitis A and hepatitis E are mainly transmitted through the digestive tract, and hepatitis B, hepatitis C, and hepatitis D are mainly transmitted through blood and body fluids. Some infectious hepatitis of unknown etiology also exist in the clinic.