Fever from upper respiratory tract infection usually lasts for 1~3 days, if it lasts for more than 3 days, you need to consult a doctor to rule out other diseases. Fever caused by upper respiratory tract infection is usually around 1~3 days, which is usually mild, and after 1~3 days of rest and symptomatic treatment, the fever symptoms can usually be controlled, and with the progress of the disease, such symptoms can also be relieved. However, if the fever persists for more than 3 days, other diseases such as lung infection can be excluded. Since the fever has been treated according to upper respiratory tract infection without symptomatic antimicrobial treatment such as penicillin, which leads to continuous bacterial reproduction and expansion, and makes the fever symptoms never get relieved, it is necessary to consult a doctor in time and follow the doctor’s instructions for examination and treatment.