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Allergy Basics Center

An allergen is any substance that the body perceives as a threat, triggering a specific chain of events called an allergic cascade. The immune system protects the body and sometimes mistakenly identifies a harmless allergen as a threat. The resulting allergic reaction causes symptoms, such as sneezing, coughing, runny nose, sore throat, diarrhea, vomiting, itching and hives.

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Outwit Your Allergies!
Brought to you by:Allergies Inside and Out


Birch trees. Ragweed. Dust mites. Dander. Mold. Whatever triggers your sneezes, indoors or out, protect yourself and...breathe easy.

In Allergies, Inside & Out, you'll learn how to:

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Dr. Madelyn Fernstrom

Find out what our expert has to say about allergies, asthma and other health issues in Health Journal, with Dr. Fernstrom.

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Copyright (c) 2000-2008 iVillage Inc. All rights reserved. The information provided on this site is intended for your general knowledge only and is not a substitute for professional medical advice or treatment for specific medical conditions. You should not use this information to diagnose or treat a health problem or disease without consulting with a qualified healthcare provider. Please consult your healthcare provider with any questions or concerns you may have regarding your condition.