When a child always coughs, the first thing to do is to identify the cause of the child’s cough and treat it for the cause. The common causes of cough in children are as follows: a. Infection factors: Infection by pathogens such as bacteria, viruses and mycoplasma can cause repeated coughing in children and cause bronchitis and bronchopneumonia. The child should be given routine blood tests, mycoplasma antibodies, chest X-ray and lung CT. If the child has a bacterial infection, cephalosporin and penicillin antibiotics can be used. If there is mycoplasma infection, azithromycin or roxithromycin can be used. Second, allergic factors: such as allergic cough and cough variant asthma, etc. The child should be given an allergen test and, if necessary, a pulmonary function test, and if the allergic principles that can detect the child’s cough should be avoided. Oral antihistamines, such as cetirizine and loratadine, oral leukotriene receptor antagonists, such as montelukast sodium, and nebulized inhalation therapy if necessary, and nebulized inhalation drugs such as budesonide and terbutaline. Third, other causes: such as foreign body inhalation, bronchial and lung dysplasia, etc., should be treated according to the cause, and if there is foreign body inhalation, the foreign body needs to be removed by fiberoptic bronchoscopy.