Fever on the 8th day after MMR vaccination is not considered to be related to MMR vaccine. Fever on the 8th day after MMR vaccination may be caused by cold, accumulation of food, viral infection and other reasons. According to the different causes, we can take causative treatment and symptomatic treatment, such as general treatment and medication. 1. Cold: if the body temperature is below 38℃ and the patient’s mental state is good, you can take a lot of warm water to promote urination and perspiration; or use warm towel to wipe the forehead, palms, armpits and other parts of the body, which also helps to reduce fever, and then pay attention to the changes in body temperature; if the body temperature is too high or the body discomfort is strong, you can take aspirin enteric-coated tablets, ibuprofen suspension and other medications for treatment. 2. Accumulation of food: Physical cooling methods can be adopted, such as wiping the patient’s palms, feet, forehead, armpits and other parts of the body with a warm, wet towel, and repeatedly wiping, which can achieve the effect of cooling. At the same time, take Bifidobacterium lactis triple live bacterial tablets, stomach-healthy digestion tablets and other drugs to regulate the stomach and intestines, relieve the patient’s condition. 3. Viral infection: If the patient’s body temperature is below 38℃, physical cooling can be carried out; more than 38.5℃, oral antipyretic and analgesic drugs, such as ibuprofen delayed-release tablets, acetaminophen tablets; at the same time, take antiviral drugs such as ribavirin dispersible tablets, oseltamivir phosphate capsules and other drugs for treatment. Fever on the 8th day after mumps, there may be other reasons, you should consult the doctor in time, under the guidance of the doctor’s medication.