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Allergic Rhinitis
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An allergy occurs when the body reacts to substances it can't tolerate. The substances, like tree pollen or dust mites, are called environmental antigens, or allergens, and are normally harmless. But the immune system of a person with allergies views the allergens as harmful.
Allergic rhinitis (commonly called hay fever) is an inflammation or irritation of the mucous membranes that line the nose. Allergic rhinitis happens when an allergen, such as pollen, causes your body to ... more
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