Mucus is a thick, slippery and usually clear substance that is
produced in the lining of body cavities or canals, such as the
nose, throat, sinuses, and airways of the lungs. Mucus protects
and moistens the lining of body organs, such as the stomach and
intestines, and traps dust particles, smoke, bacteria, and other
irritants that enter the nose when a person inhales. Mucus that
becomes too thick and sticky can block the airway, digestive
system, or cause other problems in the body. Thick and sticky
mucus is difficult for the body to remove and can increase the
risk of infection. eMedicineHealth Medical Reference from
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