Hay Fever

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Sinus Allergies & Sinusitis


Nasal and sinus allergies result from an immune system reaction to allergens (e.g., pollen, mold) that enter the respiratory system through the body's airways, producing a response similar to an upper respiratory infection (cold virus).

White blood cells (leukocytes) mark the allergens as intruders and produce secretions that cause the nasal lining to swell, helping to combat the invading substances. The resulting sinus allergy symptoms—sneezing; allergi...Read the full article