There may be many reasons for coughing when exercising, such as physiological reasons and bronchial asthma. 1. Physiological reasons Exercise, shortness of breath, due to large mouth breathing and skin surface evaporation will take away a lot of water, the body lack of water, the throat can appear irritating dry cough. (2) During exercise, the pharyngeal secretion is stimulated to increase, as well as inhalation of irritating gases after the airway spasm can also appear cough. This is a physiological factor caused by the cough after exercise, when such symptoms, need to drink a moderate amount of water, pay more attention, avoid exertion. 2. Bronchial asthma, including exercise variant asthma and cough variant asthma. (1) Exercise variant asthma: asthma with cough as the only symptom, due to exercise, hyperventilation induced airway hyperresponsiveness caused by cough. (2) Exercise-variant asthma: asthma with cough as the only symptom that occurs after exercise. It is common in adolescents and young adults, most of whom are allergic and have airway hyperresponsiveness. There may be other reasons for coughing when exercising, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.