Three-year-old children get up in the morning coughing may be caused by physiological phenomena, may also be bronchitis, pharyngitis and other diseases. 1. Physiological phenomenon: if the child is in a dry environment, or sleep with the mouth open at night, will lead to the respiratory mucosa in a dry state. In the morning, the mucous membrane will be stimulated, and the symptoms of coughing will appear. 2. Bronchitis: Bronchitis is induced by recurrent viral and bacterial infections, resulting in mucus or phlegm and other secretions in the airways, which may block the airways after a night’s sleep and cause a morning cough. 3. Pharyngitis: When pharyngitis occurs, the mucous membrane of the pharynx is congested and edematous, and inflammatory secretions are often attached. The inflammatory response stimulates the sensory nerve endings and produces a reflex cough in the morning. When a three-year-old child coughs in the morning, please do not judge by yourself and medication, should be under the guidance of a professional physician to identify the cause of the disease, targeted treatment and therapy.