If hepatitis B is not well controlled, it can easily lead to the occurrence of cirrhosis. After the hepatitis B virus infects the human body, it causes repeated inflammatory damage to the liver, with recurring abnormalities in liver function. If during this period there is no formal antiviral treatment or lack of attention, it is very likely to lead to the development of cirrhosis. Once cirrhosis from hepatitis B occurs, it is generally irreversible. Cirrhosis due to hepatitis B is also an infectious disease, and its level of infectiousness mainly depends on the presence of the virus. If the viral load is positive, indicated by a positive HBV-DNA test, then it is infectious. If HBV-DNA is negative, then it is not infectious. Therefore, whether cirrhosis from hepatitis B is infectious primarily depends on the level of HBV-DNA.