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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.
The following symptoms may indicate a sinus infection in your child:  1 a cold lasting more than 10 to 14 days, sometimes with a low-grade fever. 2  thick yellow-green nasal drainage. 3  post-nasal drip, sometimes leading to or exhibited as sore throat, cough, bad breath, nausea and/or vomiting.