An allergy is a hypersensitivity to a common substance in the environment.

Name: An allergy is a hypersensitivity to a common substance in the environment.
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An allergy is defined as a hypersensitivity reaction to a particular substance, such as pollen, dust, or certain foods. This reaction occurs when the immune system overreacts to the presence of the substance and triggers a cascade of symptoms, ranging from mild to severe. Common allergies include hay fever, eczema, asthma, and food allergies.

An Allergy Is a Hypersensitivity to a Common Substance in the Environment