The window period of hepatitis B refers to the period after the hepatitis B virus has infected the human body, as the body’s immune response has not yet produced antibodies, generally during this period patients will not have obvious typical symptoms, but some patients may also experience gastrointestinal discomfort, such as nausea, vomiting. Some patients may also have abdominal distension, fever, malaise, and reflex nausea at the sight of greasy food. Patients should be further monitored regularly with regular check-ups of the full set of hepatitis B as well as hepatitis B DNA and liver function; it is advisable to check the full set of hepatitis B, hepatitis B DNA and liver function 1 month or 3 months after exposure to high-risk blood or body fluids and other behaviors. If the patient is not found to be positive for hepatitis B surface antigen, he can mostly rule out hepatitis B. If he is found to be positive for hepatitis B surface antigen and replication of hepatitis B DNA, further antiviral treatment should be given as needed.