When an allergen enters the body of an individual that is predisposed to allergies, it triggers an immune reaction and the production of antibodies. These allergen antibodies migrate to mast cells lining the …

This website is the official site for the systematic allergen nomenclature that is approved by the World Health Organization and International Union of Immunological Societies (WHO/IUIS) Allergen …

May 5, 2026 · Allergens are substances that cause the body to produce an allergic reaction. Common allergy symptoms include a runny nose, congestion, cough, and sneezing. Allergy treatment involves …

Apr 3, 2025 · The type of allergic reaction and its symptoms depend on the allergen and whether you inhaled it, ate it or touched it.

An allergen is a usually harmless substance capable of triggering a response that starts in the immune system and results in an allergic reaction. For instance, if you have an allergy to pollen, your immune …

Allergens may be naturally occurring or of synthetic origin and include pollen, mold spores, dust, lint, animal dander, insect debris, foods, blood serum, and drugs.

Mar 18, 2026 · How a person reacts to an allergen depends on how they come in contact with it. In many people, allergic reactions occur on the skin and in the airways and mucous membranes.

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.

Almost any substance in the environment can be an allergen. The list of known allergens includes plant pollens, spores of mold, animal dander, house dust, foods, feathers, dyes, soaps, detergents, …

Environmental Allergy Avoidance If it's not possible to completely avoid an allergen, there are things you can do to decrease your exposure. Here are some steps you can take to avoid contact with allergens …