Allergy FAQs

What Is Seasonal Allergic Rhinitis?

Usually called "hay fever," seasonal allergic rhinitis is caused by an allergy to the pollen of trees, grasses, weeds or mold spores. Seasonal allergic rhinitis may occur in the spring, summer or fall and may last until the first frost. The "season" depends on which allergen  […]

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What Is an Allergy?

An allergy is an abnormally high sensitivity reaction to an ordinarily harmless substance. The immune system of an allergic person reacts when an allergen is absorbed into their body, treating the substance as a harmful invader, causing the white blood cells to begin producing IgE antibodies which  […]

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