When your immune system overreacts to an otherwise harmless substance like food, pet dander, pollen, or dust, this results in an allergy. Allergic responses can include everthing from sneezing, itchy, watery eyes, to life-threatening responses like difficulty breathing, low blood pressure, and anaphylaxis. Find expert information on the symptoms, causes, and medications used to treat allergies.

Allergy Basics

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What Are Allergies?

Seasonal Allergies

when is allergy season
When Is Allergy Season—And When To Start Preparing?

Treatment and Management

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Explore Allergies

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Signs and Symptoms of Allergies
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Allergies That Might Seem Surprising
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How Are Hives Treated?
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