Allergies are caused by the activation of white blood cells called mast cells and basophils such as ImmunoglobulinE IgE, an antibody in response to exposure to normally harmless environmental elements. Testing the skin to determine the presence of IgE levels is one method to check the level of allergic reaction, and treatment varies from allergen avoidance to prescription of anti-histamines, steroids, and immunotherapy in order to desensitize the body's response to the allergen. Here some of the more common causes of allergies.
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