Not all coughs require medication. Choose medication carefully if the cough is one of the following: 1. It does not affect rest, eating, work or sleep; 2. There are no pathological respiratory secretions (coughing up pus, coughing up blood or blood in sputum); 3. There are no abnormal lung signs (no abnormal breath sounds or dry or wet stalls) on physical examination by a physician; 4. There are no abnormal findings on chest X-ray or CT examination; 5. There are no nasopharyngeal malignant diseases. A cough with all the above 5 points does not require drug treatment. On the contrary, coughing is a protective reflex of the body, and studies have reported that giving ACEI medication to induce coughing in patients with diabetes mellitus with cerebrovascular accidents can prevent pneumonia.