If your child coughs when he runs, he is likely to have exercise-induced asthma. You need to take your child to have a bronchodilator test or bronchial provocation test to see if there is any airway hyperresponsiveness. If the test result is positive, it means that the child has exercise-induced asthma. Avoiding strenuous exercise at this time is one of the most effective ways to relieve the cough. In addition, nebulized inhalation drugs can be used to relieve the symptoms of cough, such as nebulized inhalation of terbutaline sulfate and budesonide, terbutaline sulfate is a bronchodilator, which can effectively relieve the symptoms of cough; budesonide is a kind of glucocorticosteroid, which can attenuate local inflammatory response, and also has a certain degree of efficacy in the prevention of exercise asthma. You can also give your child a chewable tablet of montelukast sodium before bedtime, which can also diminish coughing attacks. Therefore, if your child has a cough when running, it is necessary to have a specific examination and then professional anti-asthma treatment.