Cough is not a disease, but a symptom, the symptoms of cough caused by different diseases are not the same, some patients have a more serious cough during the day, less or no cough at night; some patients have a more serious cough at night, less or no cough during the day, which is mainly due to the different causes of cough. Generally speaking simple daytime cough, the night does not cough relatively few, if the patient long-term only daytime cough, the night sleep less cough, generally due to mental factors caused by coughing, known as psychological cough, is due to mental factors caused by the patient’s involuntary cough symptoms. Compared with the daytime cough, caused by the patient to cough at night is more common, common cause of the patient’s cough at night or night cough aggravation of the disease are cough variant asthma, gastroesophageal reflux pharyngitis caused by cough, cardiogenic factors caused by cough and so on. Cough variant asthma is characterized by episodic cough, which is usually exacerbated at night or in the early morning. Gastroesophageal reflux pharyngitis (GERD) is aggravated by acid reflux, which is more likely to occur when the patient is lying down.