Coughing when a child runs can be caused by inhaling irritating gases during running, or by the presence of bronchitis or asthma. 1. Inhalation of irritating gases: If a child inhales irritating gases during running, such as airborne dust and smoke, it may lead to coughing. 2. Bronchitis: If the child suffers from bronchitis, the sensitivity of the respiratory tract will be higher, in the process of running due to the speed of breathing, throat airflow accelerated, it will be easy to appear coughing symptoms. 3. asthma: if the child suffers from asthma, usually there will be coughing symptoms, usually in the morning and at night when coughing, the symptoms will be more obvious, exercise due to the child hyperventilation, coughing will also be more obvious. The child coughs when running, it is recommended to actively go to the regular hospital to do the examination, to find out the specific causes, under the guidance of the doctor to use the appropriate treatment program, so as not to delay the condition.