Children with fever after MMR vaccination, if the fever symptoms are mild, it is mostly an immune response to the vaccine, and can usually be relieved after a few days. If the fever is more severe, the child should go to the hospital in time to clarify the cause of the illness. If it is due to the body’s immune response to the MMR vaccine, does not belong to the state of the disease, you can give the child appropriate to drink more warm water, appropriate use of warm water to wipe the body, light diet, usually a few days of fever symptoms can be relieved on their own. If the child after the MMR vaccine fever symptoms are heavier, then no longer consider it a simple vaccine reaction. It may be because of this before the vaccine, or after the vaccine infection, etc., after the vaccine due to the immune response, may induce the disease progression, the phenomenon of fever. It is important to go to the hospital for diagnosis and treatment to clarify the cause of the disease. Parents should follow the doctor’s instructions and actively cooperate with the doctor to treat the child, do not blindly treat yourself, so as not to delay the disease or cause adverse reactions.