immunoglobulin E

Immunoglobulin E (IgE) is a type of antibody that your immune system produces. Its main role is to help protect you against certain parasites and to respond to allergens like pollen, dust, or pet dander. When you encounter an allergen, IgE binds to it and triggers the release of chemicals such as histamine, which cause allergy symptoms like sneezing, itching, or swelling. In people with allergies, IgE overreacts to harmless substances, leading to uncomfortable reactions. Overall, IgE is a key part of immune defense, especially in allergic responses.