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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.
Postnasal drip also commonly causes excess mucus at the back of your nose and throat many times after eating. Excessive, thick phlegm or chest mucus can often be caused by viral or bacterial infections such as influenza, bronchitis and pneumonia, as well as irritants such as those inhaled during smoking. Chemotherapy also causes the immune system to overreact and excessive phlegm is often the result.