The third shot of the new crown vaccine appear high fever can use physical cooling, medication to reduce fever, if it is caused by other pathogens infection, should be directed to the cause of the treatment. After the third injection of the new crown vaccine, some people will appear high fever, you can use physical cooling, such as warm water baths, alcohol baths, antipyretic patches, local massage, ice packs and other physical ways to reduce heat treatment. If the effect of physical cooling is relatively poor, you can use drugs to reduce fever, such as ibuprofen, acetaminophen, Xiao Chaihu granules, lysergic acid, compound aminobarbitone injection and other antipyretic treatment. If the fever persists, it is recommended to go to the fever clinic of the hospital as soon as possible, complete the blood routine and other inflammatory indicators to assess whether it is caused by a combined bacterial or viral infection, and according to the etiology of the disease, give the appropriate medication, such as cefaclor, amoxicillin, oseltamivir and other treatments. Specific drugs should be used under the guidance of a doctor.