| http://www.w3.org/ns/prov#value | - Most of the time, mucus is able to drain out and air is able to flow through the sinuses.Previous imagePlay SlideshowStop SlideshowNext image / When the sinus openings become blocked or too much mucus builds up, bacteria and other germs can grow more easily.Sinusitis can occur from one of these conditions:Small hairs (cilia) in the sinuses fail to properly to move mucus out.
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