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From Mold Exposure. Sinus congestion, also referred to as sinusitis or a sinus infection, is one of many potential health effects of mold exposure. It causes the sinuses, or nasal passages, to become swollen and inflamed. This interferes with drainage, so you feel stuffed up.
Sinus infections happen when you âcatch a bugâ and a virus, bacteria or mold settles in the sinuses and causes inflammation of the area lining your sinuses. The sinus cavity, which is like a dark cave, fills up with fluid and becomes blocked.