Phlegm in the throat and trachea needs to be treated with different medications depending on the cause. Common causes include viral infections, bacterial infections, and smoking. 1. Viral infections: the more common are acute pharyngitis, viral colds and so on. Antiviral drugs are usually used, such as synthetic fisetin tablets, pudilan oral solution and so on. Combined with acetylcysteine, eucalyptus-pinocampus enteric soft gelatin capsule and other expectorant drugs. 2. Bacterial infection: more common acute pharyngitis, bronchitis, etc.. Antibiotics, such as cefixime, amoxicillin, etc., are usually used. Combined with the application of aminobromine, snake gall and Sichuan shellfish liquid and other expectorant drugs. 3. Smoking: Smoking stimulates the mucous membrane will have inflammation formation, often will form a lot of secretion. Commonly used compound licorice combination, compound loquat cough granules, etc. to promote the discharge of phlegm, and at the same time, need to quit smoking in a timely manner. All of the above drugs need to be used under the guidance of a doctor, and the specific dosage should also follow the doctor’s instructions. Do not self-medicate to avoid adverse reactions.