Allergen

An allergen is a substance that triggers an allergic reaction in some individuals. Common allergens include pollen, dust mites, pet dander, certain foods (e.g., nuts, shellfish), and insect stings. When exposed to allergens, the immune system overreacts, leading to symptoms like sneezing, itching, hives, or more severe reactions like anaphylaxis. Allergen avoidance, medication, and allergy shots are some ways to manage allergies and improve quality of life.