The full name of hepatitis B is hepatitis B. Hepatitis B infection in human body can cause acute hepatitis, chronic hepatitis and asymptomatic carriers. Asymptomatic carriers are those who have viral infection but have no obvious clinical symptoms and abnormal biochemical indicators, and a few patients may evolve to liver failure because it is not easily detectable. In addition, the common symptoms of hepatitis B patients include: a. Acute hepatitis: mainly manifested as weakness, anorexia, deepening of urine color, pain in the liver area, loss of energy for study or work, etc. There are two types of acute jaundice type and acute non-jaundice type. 1. Acute jaundice type hepatitis: can be divided into three stages: pre-jaundice, jaundice period and recovery period, pre-jaundice can appear anorexia, loss of appetite, weakness and other symptoms. Jaundice period can appear urine color deepening, sclera and skin yellow staining typical symptoms. Recovery period jaundice gradually subsided, liver function returned to normal; 2, acute non-jaundice hepatitis: only fatigue, indigestion or asymptomatic. Chronic hepatitis: chronic hepatitis can develop into cirrhosis, usually with insidious onset and slow development, clinically divided into compensated and decompensated stages. 1, compensated stage: there can be no symptoms or mild symptoms, such as abdominal discomfort, fatigue, loss of appetite, indigestion and diarrhea, etc., mostly intermittent, often after exertion, mental stress or accompanied by other diseases; 2, decompensated stage: mainly have Decompensated liver function and portal hypertension are two types of symptoms. Decompensated liver function is manifested by digestive malabsorption, malnutrition, dry skin, jaundice, bleeding, anemia, endocrine disorders, irregular low-grade fever, lower limb edema and abdominal fluid in some patients. If portal hypertension occurs, it will also manifest as abdominal wall varices, esophagogastric fundic varices, hypersplenism and splenomegaly, and spider nevus in the chest and abdomen. Third, liver failure: A few patients may suffer from life-threatening or even death if they are complicated by bleeding fundic varices, hepatic encephalopathy, infection, hepatorenal syndrome, portal vein thrombosis and other chronic failure of multi-organ function.