Viral fever usually has three stages: 1. The first stage is the onset of the disease, which is mainly characterized by common respiratory tract infection symptoms, such as fever, cough, sore throat, dizziness, headache, etc. 2. Some patients will have repeated high fever, with body temperature up to 39℃ or 40℃, accompanied by general aches and pains, weakness and other symptoms. Without medication, it takes a long time, up to 7 days, to rely on the body’s own immunity. 3, the third stage is the recovery period, with the medication and the body’s immunity to enhance, the symptoms will gradually improve, the body temperature will gradually drop to normal, while coughing, coughing and other symptoms will continue for 2-3 days to gradually ease.