What is an Allergy?

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What is an Allergy?
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Health A-Z Video What is an Allergy? What is an Allergy? 2:17

What is an Allergy?

What is an allergy? Allergies are your immune system's response to a normally harmless substance. Most common allergies include pollen, pets, and food. Learn more about how to spot an allergy.

Featured Expert: Yudy K. Persaud M.D., M.P.H. Allergy and Asthma Family Care »

Watched
What is an Allergy?
Health A-Z
Health A-Z Video What is an Allergy? What is an Allergy? 2:17

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