After being infected with hepatitis B, if it leads to acute hepatitis B, symptoms of hepatitis B usually appear within 60-90 days, or this time may be shortened to 30 days or extended to 160 days, 60-90 days is only a relatively average time. The symptoms of hepatitis B are usually liver function impairment, followed by a number of symptoms, including gastrointestinal symptoms and general symptoms such as fatigue, pain or distension in the liver area, and jaundice. If chronic hepatitis B is caused, it is likely to become chronic without going through the symptoms of acute hepatitis B. At this time, there are no symptoms, and the state of chronic hepatitis B may be a state of viral carriage, that is, without any damage to liver function, and it is necessary to wait until the immune clearance period before there may be symptoms, and the incubation period is particularly long, likely to reach more than ten years or even decades.