What is an Allergy?

An allergy refers to an exaggerated reaction by our immune system in response to bodily contact with a foreign substance.

Allergy-producing substances are called "allergens." Examples of allergens include pollen, dust mite, mould, dander and food.

Immunoglobulin E (IgE) is a protein involved with allergic reactions; it is normally found in very small amounts in the blood. IgE is an antibody that functions as part of the body's immune system and helps to defend against "intruders". When someone with a predisposition to allergies is exposed to a potential allergen, they may become sensitized. Their body sees the potential allergen as a foreign substance and produces a specific IgE antibody.

At the time of the next exposure, these attached IgE antibodies recognize the allergen and cause the mast and basophil cells to release histamine and other chemicals which results in an allergic reaction that begins at the exposure site.

What are the Symptoms?

Symptoms such as:

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  hives,
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  Headaches,
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  migraines,
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  tiredness,
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  rhinitis (nasal blockage, sneezing),
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  red itchy eyes,
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  asthma,
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  digestive disorders
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  or severe reactions such as anaphylaxis

All can be caused by an allergy.