Hepatitis B is contagious. Hepatitis B refers to viral hepatitis B. It is a relatively common chronic infectious disease, and the definitive infectiousness may be transmitted through blood, sex, and mother-to-child transmission. However, the degree of hepatitis B contagiousness is different, if it is hepatitis B triple positive, it means that the hepatitis B virus is currently replicating actively, and the contagiousness is also higher. In the case of hepatitis B minor triple positive, although there is also a certain degree of contagiousness, but due to the low replication activity of the hepatitis B virus, the contagiousness will be smaller. Hepatitis B patients should actively cooperate with the doctor to take treatment, and should pay attention to protection, to avoid infecting others, if the family members are recommended early injection of hepatitis B vaccine.