The common causes of coughing at night are cough variant asthma, reflux esophagitis, cardiac insufficiency, and dry air at night. 1. Cough variant asthma: a special type of asthma disease in which coughing is the main symptom, which develops mostly at night and gives rise to the symptom of coughing at night. 2. Reflux esophagitis: coughing symptoms are caused by the reflux of stomach contents into the pharynx, which irritates the pharynx at night after sleeping flat on the back. 3. Cardiac insufficiency: after lying down at night, cardiac insufficiency will lead to increased pulmonary stasis and aggravated cough at night. 4. Dry air at night: Because of dry air at night, breathing with the mouth open during sleep can stimulate the pharynx and cause coughing symptoms. It is recommended to go to a regular hospital to get a clear picture of the cause of the cough and follow the doctor’s instructions to standardize the treatment.