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What are the differences between allergies and sinusitis?

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What are the differences between allergies and sinusitis?

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Allergies represent an inflammatory condition within the nose due to exposure to specific triggers such as tree or grass pollens, dog or cat dander, or dust and mold; these triggers lead to histamine release within the nose and thus a cascade of events that leads to congestion, clear watery mucus, frequent sneezing, itchy eyes, and frequent nose blowing. Allergies can, by themselves, be a source of discomfort; however, allergic inflammation can also cause swelling of the small openings into the sinuses and lead to impaired airflow and mucus drainage. Sinusitis develops when this impaired airflow leads to pressure headaches or impaired mucus drainage leads to bacterial growth within the sinuses and an infection develops. Symptoms of an acute sinus infection can include nasal congestion, facial pain and pressure, pain in the upper teeth, discolored nasal discharge, cough and fever.

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