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Quick Answer. Constant phlegm in the throat may be a symptom of pneumonia, cystic fibrosis or asthma, according to Healthgrades. Excess phlegm can also be a result of smoke exposure, dairy products, certain medications and airway obstruction. Continue Reading.
Back to Top Causes. Pharyngitis is caused by swelling in the back of the throat (pharynx) between the tonsils and the (larynx). Most sore throats are caused by colds or the flu. Coxsackie virus or mononucleosis can also cause sore throat. Bacteria that can cause pharyngitis in some cases. 1  Strep throat is caused by group A streptococcus. 2  Less commonly, bacteria such as corynebacterium, gonorrhea, and chlamydia can cause sore throat.