Allergies are immune system reactions that occur when the body mistakenly identifies harmless substances, known as allergens, as harmful. Common allergens include pollen, dust mites, pet dander, certain foods, insect stings, and medications. When exposed to an allergen, the immune system releases chemicals such as histamine, leading to symptoms like sneezing, itching, runny nose, skin rashes, swelling, and breathing difficulties. Allergic conditions range from mild reactions, such as hay fever, to severe and life-threatening responses like anaphylaxis. Genetic predisposition and environmental factors play a significant role in the development of allergies. Diagnosis often involves skin tests or blood tests, while treatment may include antihistamines, corticosteroids, avoidance of triggers, or immunotherapy. Effective allergy management improves quality of life and helps prevent complications such as asthma or chronic sinus problems.
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