3-year-old children get up in the morning cough is mainly caused by physiological factors, pharyngitis, bronchitis and other factors. 1. Physiological factors: 3-year-old children get up in the morning only occasional cough, may be a normal psychological phenomenon, because in the night time when sleeping in the airway there will be a buildup of waste products, in the morning after waking up, there will be occasional cough, usually no other clinical symptoms. 2. Pharyngitis: usually associated with viral or bacterial infections, the symptoms of coughing will appear when you get up in the morning, which may be accompanied by sore throat, itchy throat, foreign body sensation in the throat, discomfort in swallowing and other symptoms. 3. Bronchitis: usually secondary to upper respiratory tract infections, mostly associated with viral infections, can lead to 3-year-old children in the morning to wake up coughing symptoms, in the early stages of a dry cough, followed by sputum can be produced, in severe cases, will also make the children appear fever, headache, fatigue and other symptoms. 3-year-old children get up in the morning cough may also have other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.