An allergy refers to an exaggerated reaction by our immune system in response to bodily contact with certain foreign substances. These foreign substances are usually harmless to the body and no response occurs in non- allergic people. However the body of allergic people do not recognize the foreign substance and one part of the immune system is turned on. Allergy-producing substances are called "allergens." Examples of allergens include pollens, dust mite, molds and foods. To understand the language of allergy it is important to remember that allergens are substances that are foreign to the body and can cause an allergic reaction in certain people.When an allergen comes in contact with the body, it causes the immune system to develop an allergic reaction in persons who are allergic to it. People prone to allergies are said to be allergic or "atopic."

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