Hepatitis B patients in advanced stages of liver cancer may lead to hepatitis B contagion, but not to liver cancer contagion. Hepatitis B is a contagious disease, whether in the carrier state of hepatitis B, chronic hepatitis B, cirrhosis of hepatitis B, or even complications of liver cancer, at an advanced stage, this condition is contagious. The size of contagiousness does not depend on the specific stage, but on the amount of hepatitis B virus in the blood circulation. If the amount of virus is high, the possibility of contagiousness is higher, and if the amount of virus is low, the possibility of contagiousness is lower. In the advanced stage of hepatitis B cancer, the amount of virus usually does not change significantly, but if related treatment is carried out and oral anti-hepatitis B virus drugs are taken, the amount of virus can be suppressed to a very low level and the possibility of transmission through blood will be very low. Liver cancer is not contagious because the cancer cells are the patient’s own, bearing the imprint of that person, and even if they are inoculated into other people’s bodies, they will be immediately recognized and cleared by other people’s immune systems.