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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.
An allergy to mold and mildew causes sinus headaches and nasal congestion. Headaches and congestion from mold and mildew are the result of a mold allergy, according to the Asthma and Allergy Foundation of America. A mold allergy is defined by MayoClinic.com as an overreaction of the immune system to mold spores.