Cough and sputum at night, the main consideration with cough allergic asthma, respiratory tract infections, gastroesophageal reflux disease, cardiac insufficiency and other diseases related to the cough. 1. Cough allergic asthma: allergy caused by increased airway sensitivity, and cough as the only symptom, there is a history of exposure to cold air, dust, pollen, etc., the symptoms of coughing and coughing sputum at night are more pronounced. 2. Respiratory tract infections: due to bacterial, mycoplasma, viral and other microbial infections, can stimulate the respiratory tract local mucosal tissues, inflammation, causing pneumonia, pharyngitis, bronchitis and other diseases, can cause coughing at night, phlegm symptoms. 3. Gastroesophageal reflux disease (GERD): the reflux of gastric contents through the esophagus into the pharynx can irritate the local mucous membranes, and the reflux symptom can be relatively obvious when lying down at night, thus causing symptoms of coughing and sputum at night. 4. Cardiac insufficiency: hypertensive heart disease, coronary atherosclerotic heart disease and other diseases can cause left heart insufficiency, night rest when lying down, the increase in the volume of return blood is obvious, the heart load, further aggravation of pulmonary stasis, cough, cough sputum and other symptoms, manifested as cardiogenic dyspnea. The symptoms of coughing and sputum at night, it is recommended to consult a doctor in time, improve the lung function, cardiac ultrasound, chest CT and other examinations, identify the cause and then actively treat, so as not to delay the condition.