Allergies: Overview

Allergies occur when the immune system responds to a substance. Common examples include dust allergies, pollen allergies (causing hay fever and respiratory allergies) and food allergies. But there are many other types of allergy. An allergic reaction can be dangerous when it leads to an anaphylactic reaction (anaphylaxis, anaphylactic shock). The substance that the body reacts to is called an Allergen (e.g. Pollen, Dust, Animal Hair, Dander, etc.). An allergic reaction needs to be distinguished from other types of body reactions to substances, such as an “intolerance” (e.g. food intolerances vs food allergies) or adverse reaction (e.g. poisoning, overdose, etc.).

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Note: This site is for informational purposes only and is not medical advice. See your doctor or other qualified medical professional for all your medical needs.