Patients feel phlegm in the chest, which may be related to bronchitis, pneumonia, pulmonary fibrosis and other diseases, it is recommended to clarify the cause of the disease and then actively treat it. 1. Bronchitis: patients should take proper rest, pay attention to warmth, drink plenty of water, and avoid inhaling dust and irritating gases. Patients can take cough suppressants, such as dextromethorphan, pentoxyverine, etc.; expectorants, such as aminoglutethimide hydrochloride, bromhexine, etc.; antibiotics, such as ibuprofen, cephalosporin, etc.; and antiallergy drugs, such as aminophylline, etc., under the guidance of a doctor for treatment. 2. Pneumonia: Pneumonia patients should pay attention to rest, avoid exertion, supplement enough protein, calories and vitamins, and increase the amount of water intake appropriately. Patients can take antibiotics, such as cefixime, ertapenem, etc.; antiviral drugs, such as ganciclovir, oseltamivir, etc.; expectorants, such as bromhexidine, etc., under the guidance of doctors for treatment. 3. Pulmonary fibrosis: according to the cause of pulmonary fibrosis, glucocorticosteroids, such as methylprednisolone, etc.; immunosuppressants, such as cyclophosphamide, etc.; antifibrotic drugs, such as pirfenidone, etc., and bacterial infections can be combined with the use of amoxicillin, cephalexin, etc. for treatment. It is recommended that patients find symptoms in a timely manner specialist consultation, improve the examination to clarify the cause of the disease, and actively cooperate with the doctor’s treatment, pay attention to warmth in life, avoid cold and flu or go to crowded places, go out and pay attention to wear a mask.