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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.
Sinusitis can be caused by many things. According to the Mayo Clinic, the most frequent cause is the common cold. Other causes include other types of viruses, bacterial infections, environmental allergies (like hay fever), and fungal infections. Exposure to mold can also cause sinusitis. Some people are allergic to mold, which triggers sinus problems for them. Mold is also a fungus, and tiny mold spores drift around in the air, where they are easily inhaled.