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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 result of this, when not treated earlier, is the formation of dry mucus on the opening that will then trigger infections. When the opening of the nose is dry, the nasal passage is also dry. This may cause pain in the lining of the nasal and sinus. A dry mouth can be a symptom of sinusitis infection. Another cause of this is the low humidity of the place.