Liver disease is mainly viral hepatitis, which is contagious, and other hepatitis, such as alcoholic hepatitis, drug-related hepatitis, and autoimmune hepatitis, which is not contagious. Viral hepatitis includes hepatitis A, B, C, D and E. There are fecal-oral transmission, blood transmission, mother-to-child transmission, skin and mucous membrane transmission, etc., as follows: 1. Fecal-oral transmission: Hepatitis A and E are diseases transmitted through the fecal-oral route of the gastrointestinal tract, which generally cause outbreaks of epidemics after water or diet is contaminated. 2. Blood transmission and mother-to-child transmission: Hepatitis B, D and C are all transmitted by Blood transfusion and application of blood products used to be the main route of transmission of hepatitis B and C, but with the improvement of screening methods, this route has been effectively controlled. 3, skin and mucous membrane transmission: hepatitis B and C can also be transmitted through broken skin and mucous membranes, including the use of non-disposable syringes, needles, not strictly sterilized dental instruments, invasive endoscopic manipulation and needling, and sharing of toothbrushes, shavers, razors, etc.