The basic process of fever is fast, only the degree of high or low fever varies, so when fever appears, first physical cooling, ventilation, less thick clothing, more water, more rest, and local wiping if necessary. If the fever is accompanied by headache and sore throat, and the body temperature exceeds 38.5℃, patients are advised to take oral antipyretics to avoid causing a burden on the heart and brain. Patients can also take oral antipyretic drugs. If the accompanying symptoms are more severe, patients should visit an outpatient clinic in time for a clear diagnosis and treatment. Cold and fever can be caused by various reasons, such as cold or viral infection. Viral infections cause a faster fever process, with the virus acting as a pyrogen during the viremia phase, causing the central brain to be out of control and causing fever.