In general, the duration of acute upper respiratory tract infections is about 1 week, and how long it takes for a fever to clear up depends on the specific situation. Acute upper respiratory tract infection is divided into common cold and influenza. Common cold is mostly caused by viral infection, which can be manifested as nasal congestion, runny nose, cough, sore throat, generally no fever symptoms, or only low fever, fever lasts 1-2 days, through adequate rest, or take symptomatic treatment, can be cured in about 1 week. Influenza is an acute respiratory tract infection caused by influenza virus, manifested as high fever, headache, general malaise and other symptoms, with fever lasting 3-4 days, while cough, sore throat, nasal congestion, runny nose and other symptoms are mild and can last 1-2 weeks. In addition, people with low resistance are prone to develop as pneumonia. When acute upper respiratory tract infection occurs, ensure sufficient sleep, drink more water, keep indoor air circulation, and give symptomatic medication to shorten the course of the disease.