Children get up early with phlegm during the day without coughing may be caused by excessive secretion of saliva in the mouth, but also because of bronchitis, upper respiratory tract infections and other causes. 1. Excessive secretion of saliva: the child’s trachea, bronchial tubes are narrow and short, rich blood vessels, mucous membrane tender, cilia poor motor function, weak clearance function, if excessive secretion of saliva, may cause the child to wake up with phlegm during the day without coughing. 2. Bronchitis: If the patient has bronchitis, the night parasympathetic nerve excitation, will make the airway secretion increase phlegm, wake up early to stimulate the throat to produce a cough, the daytime symptoms will not cough. 3. Upper respiratory tract infections: after the child is infected, there will be phlegm in the throat, aggravated at night with a cough. There may be other reasons why children wake up early with phlegm and don’t cough during the day, so it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.