Coughing in the morning and evening may be related to temperature changes, acute respiratory infections, chronic respiratory diseases, cardiac insufficiency and other causes. 1. Temperature changes: most areas have lower temperatures in the morning and at night. Cold air stimulates the mucous membrane of the airway, which can lead to spasm of the airway and cause cough in the morning and evening. 2. Acute respiratory infections: patients may have symptoms such as coughing, coughing up sputum and fever in the morning and evening. 3. Chronic respiratory diseases: bronchial asthma, chronic bronchitis, bronchial dilatation and other respiratory diseases, lying down, get up when the airway secretion flow can stimulate the airway, induced morning and evening cough. 4. Cardiac insufficiency: when patients lie down at night, the heart load increases, and there may be pulmonary stasis, inducing cough. In the morning, the sympathetic nerves start to wake up, the heart rate increases and blood pressure rises, which can increase the burden on the heart, thus inducing cough. Cough in the morning and evening may also be due to other diseases, it is recommended that patients seek timely medical care, improve the examination, and clarify the cause of the disease after targeted treatment.