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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.
Allergenic mold can cause all of the following health problems: Allergic Rhinitis: This condition, which affects 20-30% of the population, leads to a chronic and sometimes severe runny nose. In addition to being a source of irritation, this condition can lead to poor sleep quality and sinus infections.