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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.
Symptoms of a sinus infection can include. 1  pain or pressure sensations over the involved areas of the face along with tenderness and swelling, 2  stuffy nose, or nasal congestion, 3  drainage or discharge from the nose, 4  cough, 5  earache, 6  pain in the jaw or teeth,  and nausea.