There are many reasons why children cough when they are hot, usually due to respiratory tract infection, allergic cough, asthma and other diseases. 1. Respiratory tract infections: mainly caused by bacteria or viruses, children in the hot environment, can lead to a large number of pathogenic bacteria in the body, aggravate the inflammatory response of the respiratory tract, causing coughing; if the disease is in the recovery period, the inflammation subsides, but the bronchial mucosa has not been fully restored by the heat stimulation, it may also trigger coughing. 2. Allergic cough: If a child suffers from allergic cough, the mucous membrane of the respiratory tract is easily stimulated by various factors. After the heat, the airway mucosa is easily triggered by the stimulation of reflex cough. 3. Asthma: patients with asthma have airway hyperresponsiveness, and under heat stimulation, the bronchial tubes release inflammatory mediators, triggering the occurrence of asthma. If there is cough variant asthma, there can be intense cough performance. Children cough when hot may have other reasons, should be timely to the hospital, clear cause, under the guidance of the doctor’s treatment.