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An allergic reaction is an abnormal immune system response to things that are normally harmless to most people. When one is allergic to something, the immune system incorrectly identifies this substance as harmful to one's body. (Substances which cause allergic reactions, such as certain foods, medicines, plant pollen, or dust, are called allergens.)

In an attempt to protect the body, the immune system produces immunoglobulin E antibodies. When the IgE antibodies make contact with the allergens, they attach onto it and release chemicals such as histamine into the bloodstream. The histamine causes such allergic reactions as a runny nose, tearing eyes, sore throat, diarrhea, skin rashes, or difficulty breathing and swelling.

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16y ago

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