Many mild coughs are caused by mild laryngitis. A visit to the ENT doctor can reveal congestion and edema in the throat and lymphoid follicular hyperplasia. If there is no pharyngitis, the child needs to be given a chest CT to rule out a mild cough caused by a lung disease, which needs to be targeted to the specific disease. In addition, the child should be checked for bronchodilator test or bronchial excitation test. If the test result shows (+), it indicates that the child has airway hyperresponsiveness and probably has a mild cough caused by cough variant asthma, which requires long-term treatment with anti-asthma medications, such as chewing one chewable tablet of montelukast sodium at bedtime and nebulized inhalation of terbutaline sulfate and budesonide at regular intervals.