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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.
Phlegm is mucus (sputum) coughed up from the chest. It reveals inflammation in the respiratory organs below the vocal cords (voice box, windpipe, bronchi and lungs). From the color and density of phlegm, and accompanying symptoms, its cause may be suspected. Drinking milk or other thick drinks can make originally clear mucus thick. 2  Milk may cover the back of the throat, but milk itself does not cause mucus. 3  In gastroesophageal reflux disease (GERD) , gastric acid may back up from esophagus into the windpipe and throat.