Oct 15, 2025 · Key Takeaways Allergens are substances that cause the body to produce an allergic reaction. Common allergy symptoms include a runny nose, congestion, cough, and …

Jan 1, 2025 · 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.

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 …

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.

Aug 24, 2024 · Allergies happen when the immune system reacts to a foreign substance that gets inside the body. These substances are known as allergens. They include pollen, bee venom …

Mar 31, 2024 · An allergy is an immune response or reaction to substances that are usually not harmful. Allergies are very common. Both genes and environment play a role. If both your …

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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 …

Jun 12, 2025 · The substance it reacts to is known as an allergen. When an allergic reaction occurs, allergens bind to antibodies that the body produces called immunoglobin E (IgE).

Sep 10, 2025 · 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.