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 environment.

Featured Image. Picture of Psoriasis. A reddish, scaly rash often located over the surfaces of the elbows, knees, scalp, and around or in the ears, navel, genitals or buttocks...

allergy n. , pl. , -gies . An abnormally high sensitivity to certain substances, such as pollens, foods, or microorganisms

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 thing.

Allergy information includes articles on allergies, symptoms, treatment, medications, food allergies, and allergy relief.

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-certified allergist makes ...

PubMed Health specializes in reviews of clinical effectiveness research, with easy-to-read summaries for consumers as well as full technical reports. Clinical ...

Causes. Allergies are pretty common. Both genes and environmental factors play a role. The immune system normally protects the body against harmful substances, such ...

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

noun, plural -gies. 1. an abnormal reaction of the body to a previously encountered allergen introduced by inhalation, ingestion, injection, or skin contact, often manifested ...