Hepatitis A, short for viral hepatitis A, is an infectious disease caused by the hepatitis A virus that infects the human body and is characterized by inflammatory lesions of the liver. Hepatitis A is an acute infectious disease caused by Hepatitis A Virus (HAV), which is characterized by liver damage with loss of appetite, anorexia, and liver function abnormalities as the main clinical manifestations. The disease can occur at any age, but mainly in children and adolescents. The clinical symptoms of hepatitis A in adults are generally more severe than those in children. The main route of transmission of hepatitis A is the fecal-oral route of gastrointestinal transmission. Epidemics can occur when drinking water sources, food, vegetables, toys, etc. are contaminated with the hepatitis A virus. Poor environmental sanitation conditions can cause the hepatitis A virus excreted in the feces of infected people to enter the drinking water supply system, thus causing infection, and outbreaks of epidemics are commonly caused by contamination of water sources and food. Hepatitis A patients should go to the hospital in time, under the guidance of the doctor, complete the relevant examination, clarify the condition, and give systematic and regular treatment.