Children bronchitis cough phlegm, may be the respiratory system by pathogens infection, airway inflammation, produce abnormal secretion, secretion stimulation caused by cough. Clinical according to the auxiliary examination and symptoms of timely application of anti-infective as well as cough and phlegm medication symptomatic treatment. 1. Causes: When pathogens infect the lungs, trachea and bronchial tubes, the inflammation site secretes exudate, also known as phlegm, causing the body’s self-protection reflex action, coupled with external temperature change stimulation can also cause bronchial smooth muscle contraction, narrowing the lumen of the bronchial tubes, resulting in increased respiratory sensitivity, manifesting itself in repeated coughing, sputum, the purpose is to help clean up the respiratory tract secretions. 2. Treatment: It is recommended to go to the nearest hospital for routine blood tests, chest X-rays, respiratory pathogens test, according to the results of the selection of appropriate treatment; at the same time, add a cough and phlegm medications for symptomatic treatment. Children bronchitis cough phlegm, should go to the hospital in time to check, follow the doctor’s instructions standardized treatment, can not blindly abuse their own drugs.