Fever may occur three days after the chickenpox vaccine, but it is not considered to be very relevant to the chickenpox vaccination. Fever may occur three days after chickenpox vaccination, but it may not be related to chickenpox vaccination, because most of the vaccination reaction occurs within 24 hours of vaccination, and the body temperature is not more than 38 degrees. When fever occurs, it is recommended to monitor the body temperature, and if the temperature exceeds 38.5 degrees, antipyretic drugs can be used to treat the fever, such as ibuprofen suspension, or physical cooling to reduce the fever, and pay attention to drinking plenty of fluids. After the use of antipyretic drugs recurring fever symptoms need to test the blood routine, according to clinical symptoms to determine the cause of bacterial infection or viral infection, and then carry out symptomatic treatment, it is recommended to consult the respiratory internal medicine department of the regular hospitals, do not be negligent, in order to avoid delays in the condition.