An allergy is a hypersensitivity disorder of the immune system. Allergic reactions occur when a person's immune system reacts to normally harmless substances in the ...

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An allergy is an exaggerated immune response or reaction to substances that are generally not harmful. Allergies are pretty common. Both genes and ...

Up to 50 million Americans, including millions of kids, have an allergy. Find out how allergies are diagnosed and how to keep them under control.

Allergies affect nearly 20% of Americans. Here you'll find in-depth allergy information including treatments

Allergies are more common than ever, affecting up to 1 in 3 people. From basic concepts to in-depth discussion of specific allergic diseases, a board ...

An 'allergy' is a hypersensitivity to a particular substance that is normally harmless to most people. These allergy-causing substances are known as...

Find out how to tell if your child has allergies and what you can do to treat or prevent allergies in children.

Sneezing, difficulty breathing, cramps, and vomiting–all are allergy symptoms. Learn the types of allergies, specific allergy symptoms, and emergency warning signs.

Allergies — Comprehensive overview covers allergy symptoms, allergy testing, treatment of an allergic reaction.

Get prescription-strength allergy relief from indoor and outdoor allergies—without a prescription. Allegra, now over-the-counter (OTC), provides fast,* 24-hour ...

An allergy or allergic reaction is an abnormal immune system response to certain stimuli, like food ingredients or dust. Seasonal allergy symptoms are generally ...

A food allergy is an adverse immune response to a food protein. They are distinct from other adverse responses to food, such as food intolerance, pharmacological ...

An allergy is a reaction of your immune system to something that does not bother most other people. People who have allergies often are sensitive to more than one ...

ZYRTEC® allergy medication provides over-the-counter convenience with powerful relief from your allergy symptoms. Learn more about the 24 hour allergy treatment ...

allergy /al·ler·gy/ (al´er-je) a hypersensitive state acquired through exposure to a particular allergen, reexposure bringing to light an altered capacity to react.