Allergies: Symptoms|Treatment|Medicines

Allergy News

Celiac Disease Making Inroads in U.S.
Asthma Drugs Get 'Precaution' Labeling for Possible Psychiatric Side Effects
Point-of-Sale Printers May Trigger Asthma
Things to Know If You're Contemplating a Pet

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common questions

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What are allergies?

An allergic reaction is an overreaction of the immune system to a substance called an allergen. Allergens include chemicals, foods, medicines, mold, plants, and pollen. Symptoms of an allergic reaction can range from mild and annoying to severe and life-threatening.