Usually it is more difficult to turn positive for hepatitis B core antibody, but due to individual differences, each person has a different recovery time from hepatitis B virus infection. A positive hepatitis B core antibody indicates that the person was once infected with the hepatitis B virus, or may still have a state of hepatitis B virus infection, due to a strong autoimmune system to eliminate the hepatitis B virus, but it takes time for the autoimmune system to fight the virus or to completely clear the hepatitis B virus. If the hepatitis B virus DNA is completely cleared by the body’s immune system, the hepatitis B core antibody will also naturally turn negative. If the hepatitis B virus DNA is only controlled by the body’s immune system and no longer replicates, the hepatitis B core antibody will persist, i.e. continue to be positive. These people should pay attention to rest, avoid spicy and stimulating foods, prohibit alcohol consumption, and recommend a review at the hospital’s liver clinic every 1-2 years.