There are many reasons for coughing at night, such as cough variant asthma, gastroesophageal reflux disease, cardiac insufficiency and so on. 1. Cough variant asthma: the typical manifestation of this kind of disease is that the cough is aggravated at night, and the cough is paroxysmal. When inhaling cold air or other irritating gases at night, the cough will be aggravated. Cough variant asthma is often accompanied by nasal congestion, runny nose and sneezing during the day. 2. Gastroesophageal reflux disease (GERD): a chronic disease in which the contents of the stomach and duodenum flow back into the esophagus, resulting in a series of symptoms. When you sleep lying down, the acidic reflux material may reflux into the pharynx and irritate the throat and trachea, causing symptoms such as coughing and pharyngeal discomfort. Its can cause nocturnal cough. 3. cardiac insufficiency: some patients with chronic cardiac insufficiency, lying down at night will appear to increase the amount of return blood, the heart load increases, aggravate the lungs bruises, causing coughing, accompanied by dyspnea, coughing up pink foamy sputum, need to consult a doctor in a timely manner. There are many other reasons for coughing at night, you should go to the hospital in time, to clarify the cause of the disease, under the guidance of a professional doctor, follow the doctor’s instructions for treatment. The following are some of the reasons why you may have a bad cough at night