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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.
Sinusitis is caused by an inflammation of your sinus cavities that causes redness, swelling, mucus, and pain. There are two types of sinusitis: Acute sinusitis - an infection that is often triggered by the flu or cold. The flu or cold virus attacks your sinuses causing them to swell and become narrow.