Coughing at night and in the morning may be caused by infectious lung diseases, pharyngitis, cough variant asthma, reflux esophagitis, etc. The most common are infectious lung diseases, including pneumonia and bronchitis. 1. The most common is lung infectious diseases, including pneumonia, bronchitis, etc., due to the sympathetic nerves are more excited at night and in the morning, there is an increase in secretions after lung infection, blocking the trachea and bronchi. Then, cough can be triggered, and usually accompanied by phlegm symptoms, is one of the main reasons. 2. In addition, it may also be due to pharyngitis. Pharynx due to chronic pharyngitis, the mucous membrane of the throat area damage, can also lead to increased secretions, especially early in the morning when you can appear pharyngeal pain, pharyngeal itching, nausea and other symptoms. 3. Cough variant asthma, with the typical symptom of nocturnal paroxysmal coughing, fits the description of the characteristics, and is also one of the possible causes. 4. Reflux esophagitis, which can also be caused by a change in body position at night or in the morning. The specific cause of the cough requires prompt medical attention and examination under the guidance of a doctor to determine the cause of the cough, and treatment according to the doctor’s instructions.