Coughing at night may be caused by cough variant asthma, cardiac insufficiency, reflux esophagitis and other reasons. 1. Cough variant asthma: currently believed to be related to the environment, genetics, etc., with cough as the main or only clinical symptoms, can be due to the lowering of the temperature at night, infections, seasonal change and other factors cause cough, often at night. 2. Cardiac insufficiency: patients with cardiac insufficiency may cough at night due to an increase in the volume of returned blood at night when they are lying down to sleep, and in severe cases, wheezing and telangiectasia may also occur, and patients often have a history of heart disease. 3. Reflux esophagitis: when lying down at night, the gastroduodenal contents reflux to stimulate the pharynx, resulting in irritating cough, and there may also be acid reflux, belching and other symptoms. If the symptoms of coughing at night and not relieved for a long time, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examination, to clarify the cause of the disease, for treatment.