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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.
Sinus Symptoms. Sinus Symptom 1: Pressure. This can be felt, depending on which sinus is affected, in the face, behind the cheeks, between the nose or in the forehead. You may also experience pressure in the ears if the eustachian tubes become blocked up. Pressure in the head is also a common indication of sinus problems.