Coughing at night may be caused by left heart insufficiency, cough variant asthma, chronic bronchitis, acute upper respiratory tract infection. 1. Left heart insufficiency: patients with left heart insufficiency cough at night due to parasympathetic excitation, increased return blood flow and other reasons caused by increased cardiac load, resulting in increased pulmonary artery pressure, pulmonary edema aggravation leading to aggravation of the cough. 2. Cough variant asthma: cough variant asthma often cough as the only symptom, cough persistent or recurrent episodes for more than a month, often occurring at night or early in the morning episodes of cough. 3. Chronic bronchitis: Chronic bronchitis occurs in elderly patients who smoke, and the cough caused by chronic bronchitis often worsens at night or in the morning. 4. Acute upper respiratory tract infection: Acute upper respiratory tract infection manifests cough, sore throat, runny nose and other manifestations, acute upper respiratory tract infection cough is often aggravated at night. In addition to the above reasons, coughing at night may also be caused by tuberculosis, lung cancer, and postnasal drip syndrome. Patients with symptoms of coughing at night should go to a regular hospital in a timely manner to clarify the cause of the disease, so as not to delay the condition.