There are many reasons for coughing up phlegm, such as viral colds, chronic bronchitis and tuberculosis. 1. Viral cold: its symptoms are mostly cough with white sputum, no special anti-viral drugs, symptomatic treatment. Cough with phlegm can be given to relieve cough and phlegm medicines such as compound licorice tablets, aminobromine, etc. for treatment. 2. Chronic bronchitis: it is a chronic non-specific inflammation of the trachea, bronchial mucosa and its surrounding tissues. Clinically, coughing and sputum are the main symptoms, and the sputum is mostly white sputum. You can use levofloxacin, roxithromycin, compound licorice combination and other drugs for treatment. 3. Tuberculosis: Tuberculosis is a chronic disease, its main symptom is coughing and coughing sputum, sputum is mostly white mucus sputum. Anti-tuberculosis drugs can be used including isoniazid, rifampicin and pyrazinamide. Coughing up sputum may also have other causes, so patients are advised to go to the hospital in time to clarify the cause of the disease and under the guidance of the doctor, so as not to delay the treatment. The above drugs need to be standardized and rationally used under the guidance of professional physicians and pharmacists.