Hepatitis A, short for viral hepatitis A, is an acute intestinal infection caused by the hepatitis A virus and is generally not serious. Symptoms include loss of appetite, nausea, vomiting, fatigue, hepatomegaly and liver function abnormalities, some patients have fever and jaundice, and asymptomatic infection is common. The course of the disease is self-limiting and non-chronic, and the occurrence of acute hepatitis A is extremely rare. With the use of inactivated hepatitis A vaccine worldwide, the hepatitis A epidemic has been effectively controlled, and the majority of patients have a good prognosis with a 0.1% mortality rate, so it is not serious. The incubation period of hepatitis A infection is 15-45 days, and the infection can manifest as latent infection, subclinical infection or clinical infection. Clinical infection can manifest as acute jaundice hepatitis, partly as acute brucellosis hepatitis, and occasionally as heavy hepatitis. Acute hepatitis A treatment is mainly based on more rest, high protein, high vitamin, low fat diet, commonly used liver protection drugs such as dicyclomine, etc. Anti-viral treatment is not required. Most patients with hepatitis A recover within 3 months, and immunity can be maintained for life after the disease.