After the fever subsides, coughing symptoms may appear, which are irritating and dry non-sputum cough. The main reason is that after the fever subsides, the inflammatory reaction in the body slowly eases or even cures, but the congestion and edema inflammatory reaction of the mucous membrane in the airway does not completely subside, such as acute upper respiratory tract infection, bronchitis, pneumonia, etc. Some inflammatory reaction states of congestion and edema still exist in the mucous membrane of these parts, and it takes repair time to return to the normal mucous membrane state, which may last for about a week. Pay attention to keep warm, avoid getting cold, and give some symptomatic treatment drugs such as brown combination, aminoglutethimide syrup, etc. as appropriate.