The causes of cough in children include infectious factors, allergic factors, and foreign bodies in the airways. 1. Infectious factors: Inflammation of the respiratory tract due to viral, bacterial, fungal, mycoplasma and other pathogenic infections, such as bronchitis, pneumonia, pharyngitis, coughing can occur, which may be accompanied by fever, coughing up phlegm, sore throat, nasal congestion, headache and other symptoms. 2. Allergic factors: airway hyperreactivity due to exposure to various allergens, airway spasm with persistent or recurrent cough, mostly paroxysmal cough, more severe in the morning or at night, less sputum. Such as allergic rhinitis, bronchial asthma and so on. 3. Foreign body in the airway: causing airway obstruction, can also cause severe and recurrent cough. Children with cough symptoms are more serious, can actively seek medical attention, to clarify the cause of the disease for targeted treatment.