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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.
Chemotherapy also causes the immune system to overreact and excessive phlegm is often the result. Food allergies are known to cause excessive phlegm and certain types of food such as dairy products cause a thickening of mucous.Postnasal drip also commonly causes excess mucus at the back of your nose and throat many times after eating. Drink plenty of water to loosen the phlegm and help wash down any phlegm that gets deposited in the throat. 2  Go to a physiotherapist. 3  There are a number of breathing techniques and stretching exercises that they can teach you that will help loosen and expel excessive phlegm.