There are many causes of cough. Patients should go to a regular hospital, combine their symptoms, confirm the diagnosis through chest CT, blood tests, sputum culture and other tests, and then carry out targeted treatment. Coughing itself is a protective reflex to remove phlegm and foreign bodies from the respiratory tract, so after removing the cause, the cough will usually be controlled naturally. 1. Get rid of allergens: If the patient’s cough is caused by stimulation from external factors, such as cold weather, exposure to dust or chemical substances, etc., the patient should get rid of the allergens. 2. Medication: If the cough is more severe and the phlegm is more abundant, you can first use cough expectorants to relieve symptoms, such as dextromethorphan and bromhexine, while corresponding medications can be taken under the guidance of a professional doctor according to the cause of the disease. For example, cough caused by influenza can be treated with ribavirin; bacterial infection of the upper respiratory tract can be treated with antibiotics; cough caused by tuberculosis should be treated with isoniazid and rifampin; 3. Diet regulation: pay attention to eating less spicy and stimulating foods, such as chili peppers and fried chicken, and you can eat light, vitamin-rich foods, such as oranges and pears; 4. Other treatments: if the patient’s cough is caused by other major diseases, such as lung cancer, surgical treatment is needed to assist radiotherapy, etc.