Patients who feel phlegm in their throat and cannot breathe well are mostly caused by upper respiratory tract infections, where viruses and bacteria attack the mucous membrane of the throat, causing local congestion and edema, and inflammatory secretions ooze out, causing local narrowing of the throat and coughing up phlegm. If this symptom always appears, it is also necessary to consider that it is caused by chronic bronchitis and chronic throat inflammation, so it is best to go to the hospital for examination first. If it is caused by chronic bronchitis, you need to use cough, phlegm, asthma medication, and usually need to improve the body’s resistance to prevent respiratory tract infections.