Hepatitis B can gradually develop into cirrhosis or liver cancer. Therefore, if a hepatitis B virus infection is detected, it needs attention. If the hepatitis B surface antigen is positive in the HBV "two-and-a-half" test, it indicates a hepatitis B virus infection. Once infected with the hepatitis B virus, it is necessary to regularly check liver function and hepatitis B virus DNA, as well as have abdominal ultrasounds. If an increase in transaminases is found, it indicates the transformation into chronic hepatitis B, necessitating liver-protecting and enzyme-lowering treatments. If the hepatitis B virus DNA exceeds a certain value, antiviral treatment is also needed. After being infected with the hepatitis B virus, it is crucial to rest and avoid excessive fatigue and staying up late.