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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.
Although symptoms can vary, the most common symptoms seen in people exposed to mold indoors include: 1  Nasal and sinus congestion. 2  Eye irritation, such as itchy, red, watery eyes. 3  Wheezing and difficulty breathing. 4  Cough. 5  Throat irritation. 6  Skin irritation, such as a rash. 7  Headache.