Immunoglobulin E (IgE)

Immunoglobulin E (IgE) is a type of antibody produced by your immune system. Its primary role is to defend against parasites and detect allergens—substances like pollen, pet dander, or certain foods. When IgE encounters an allergen, it triggers the release of chemicals like histamine, leading to allergic reactions such as sneezing, itching, or swelling. In some people, the immune system overreacts to harmless substances, producing excessive IgE and causing allergies. Understanding IgE helps in diagnosing and managing allergies, and it plays an important role in immune defense.