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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.
Mold spores are inhaled, aggravating the sinus cavity, which leads to sinus inflammation, congestion and headaches, according to the Asthma and Allergy Foundation of America. Sinus inflammation causes blockage in the person's ability to breathe through the nose and the ability to properly drain mucus.