allergies

Immune responses to harmless substances (allergens) mistakenly identified by the body as a threat. An allergy, which arises when a person comes into contact with an allergen, can cause sneezing, skin rashes, itchiness and respiratory symptoms.

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About Allergies: Allergy Symptoms, Causes and Treatments

Last Modified: January 13, 2011

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Allergy symptoms are very common in industrialized nations. According to the American Academy of Allergy, Asthma and Immunology, over 54 percent of all Americans test positive for at least one allergen.… View Full Article

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