Phlegm is a type of mucus produced in the lungs and lower respiratory tract. It is most noticeable when a person is acutely sick or has a longstanding health condition.
Mucus forms a protective lining in certain parts of the body, even when a person is well. Mucus keeps these areas from drying out and helps to defend against invaders, including viruses and bacteria.
Though a healthy body requires some mucus, too much can be uncomfortable. Excess may be caused by:
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