Sinuses are moist air spaces within the bones of the face around the nose. Sinuses are lined with the same mucous membranes that line the nose and mouth.
When a person has cold and allergies, the sinus tissues make more mucous and become swollen. The drainage system for the sinuses gets blocked and mucous can become trapped in these sinuses. Bacteria, fungi, and viruses can grow there and cause sinusitisSinusitis can cause different symptoms to people of varying ages.
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