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What is an allergy?

ANSWER

It's what happens when your immune system reacts to something that’s usually harmless. Those triggers, which doctors call "allergens," can include pollen, mold, and animal dander, certain foods, or things that irritate your skin.

Allergies are very common. At least 1 in 5 Americans has one.

SOURCES: 

Asthma and Allergy Foundation of America. 

National Institutes of Health. 

American Academy of Allergy Asthma and Immunology.

Medline Plus: "Allergic Reactions."

Reviewed by Sabrina Felson on March 21, 2018

SOURCES: 

Asthma and Allergy Foundation of America. 

National Institutes of Health. 

American Academy of Allergy Asthma and Immunology.

Medline Plus: "Allergic Reactions."

Reviewed by Sabrina Felson on March 21, 2018

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What happens during an allergic reaction?

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