Allergies are an overreaction of the body's immune system to specific substances that it misidentifies as harmful. This overreaction of the body's immune system is known as an allergic reaction and the substances that cause it are called allergens. Allergic reactions manifest themselves in the form commonly seen skin and respiratory disorders such as eczema, hives, hay fever, asthma and food allergies. These also include skin and respiratory hypersensitivity reactions
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