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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.
1 Acute sinusitis is when symptoms are present for 4 weeks or less. 2  It is caused by bacteria growing in the sinuses. 3  Chronic sinusitis is when swelling and inflammation of the sinuses are present for longer than 3 months. 4  It may be caused by bacteria or a fungus.