If you were vaccinated against Hepatitis B as a child and still have enough protective antibodies against Hepatitis B when you grow up, you usually do not need to be vaccinated. If the antibody titer is not high when you grow up, you need to be vaccinated. To judge whether to take hepatitis B vaccine after growing up after having received hepatitis B vaccine as a child needs to be determined according to the actual situation, and cannot be generalized, but mainly depends on the concentration of hepatitis B protective antibody in the body at this time. If there are still enough hepatitis B protective antibodies in the body after growing up, generally speaking, if you have received hepatitis B vaccine when you were a child, you do not need to receive the vaccine again. However, if the concentration of hepatitis B protective antibody in the body is not high after growing up and has fallen below the normal range, even if you have received hepatitis B vaccine when you were a child, you need to be re-vaccinated at this time. If you are suffering from some kind of acute disease, serious chronic disease or in the period of fever, you can not be vaccinated for the time being, so as not to cause adverse effects. To summarize, it is recommended to go to the hospital to improve the liver function, hepatitis B two-half and other tests, if the results are abnormal, you need to be vaccinated and cooperate with the doctor for active treatment.