Allergen
An allergen is a substance that can cause an allergic reaction. In some people, the immune system recognizes allergens as foreign or dangerous. As a result, the immune system reacts by making a type of antibody called immunoglobulin E (IgE) to defend against the allergen. This reaction leads to allergy symptoms.
Allergic reaction
Allergic reactions are sensitivities to substances called allergens that come into contact with the skin, nose, eyes, respiratory tract, and gastroin...
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An antibody is a protein produced by the body's immune system when it detects harmful substances, called antigens. Examples of antigens include micr...
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Common allergens include:
- Animal proteins and animal dander
- Dust
- Drugs (such as antibiotics or medicines you put on your skin)
- Foods (such as egg, peanut, milk, nuts, soy, fish, animal meat, and wheat)
- Fungal spores
- Insect and mite feces
- Insect bites and stings (their venom)
- Natural latex rubber
- Pollen
Reviewed By
Linda J. Vorvick, MD, Clinical Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
Stewart GA, Robinson C. The structure and function of allergens. In: Burks AW, Holgate ST, O'Hehir RE, et al, eds. Middleton's Allergy: Principles and Practice. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 26.