MMR fever usually lasts for about 2 days. Under normal circumstances, MMR fever will gradually subside in about 2 days and are hypothermic, with low body temperature, requiring no special treatment. The patient will also not experience any obvious physical discomfort, so there is no need to be too nervous. Fever can be lowered by placing ice packs under the armpits or on the iliac fossa and other blood-rich locations, or by using physical therapy such as warm water baths to lower the temperature. If symptoms such as sneezing, runny nose, coughing, sputum, headache, etc. occur during the process of fever, it is necessary to be alert to the possibility of combining with upper respiratory tract infections, and it is best to consult a doctor in time for treatment. It is worth noting that if the MMR fever is not relieved in about 2 days, and the temperature gradually rises. It is best to consult a doctor in time to make a clear diagnosis and treat the disease as soon as possible to prevent delays.