Allergic reaction are immune responses that occur when the body overreacts to typically harmless substances known as allergens. Upon initial exposure, the immune system sensitizes to the allergen, producing specific antibodies, particularly immunoglobulin E (IgE). Upon subsequent exposure, the allergen binds to IgE on the surface of mast cells and basophils, triggering the release of inflammatory mediators like histamine. Histamine and other chemicals cause the classic symptoms of allergic reactions, including itching, swelling, redness, and, in severe cases, difficulty breathing and anaphylaxis. Allergic reactions can manifest in various forms, affecting the skin (hives, eczema), respiratory system (rhinitis, asthma), gastrointestinal tract, or the entire body. Allergies can develop at any age, and both genetic and environmental factors influence susceptibility. Public awareness, education, and ongoing research are essential for effective prevention, diagnosis, and management of allergic reactions. The severity of allergic reactions varies, ranging from mild discomfort to life-threatening emergencies. Diagnosis involves medical history, physical examination, and sometimes allergen-specific testing. Management includes allergen avoidance, medications such as antihistamines and epinephrine for severe reactions, and immunotherapy for long-term desensitization.
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