Hepatitis B is caused by a virus, hepatitis B is a chronic infectious disease caused by hepatitis B virus infection, hepatitis B can gradually progress to cirrhosis of the liver, and even liver failure and clinical death of the patient. Hepatitis B patients can appear early nausea, anorexia and other digestive symptoms, gradually progressing patients can appear fever, body discomfort, ascites, hepatosplenomegaly, and even gastrointestinal bleeding may occur. Therefore, we must pay attention to hepatitis B virus infection, once found hepatitis B virus infection, should be given oral antiviral drugs for treatment.