The main causes of morning cough in children include the following: first, symptoms caused by cough variant asthma in children. The airway sensitivity is very high in children with cough variant asthma, and the air is cooler in the cold morning, which can stimulate the respiratory tract and lead to coughing in children. Secondly, the symptoms are caused by rhinitis in children. After suffering from allergic rhinitis, nasal secretions will flow backwards to the throat, especially in the morning when they first wake up, the throat will feel uncomfortable, thus causing reflex nausea and vomiting. Third, coughing with phlegm, the child coughs up phlegm at night and in the morning.