ALLERGY BASICS

There are many types of allergies and allergic reactions. Get a basic overview of allergies, your immune system and why some people are more susceptible to allergies than others.

How much do you know about allergies?

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How Allergies Work

If you've got allergies, you know the drill -- sneezing, wheezing, itching. Know why you get these symptoms? You may be surprised at the answer. Learn about the immune-system mix-up we call an "allergy."

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