What are three symptoms of an allergic reaction?

The symptoms of hives, swelling, and difficulty breathing are indicative of an allergic reaction because they relate to the body's immune response to an allergen. Hives, or urticaria, are raised, itchy welts on the skin that occur when the body releases histamine and other chemicals in response to an allergen. Swelling, particularly in areas like the face, lips, or throat, can be a sign of angioedema, which occurs when blood vessels leak fluid, causing localized swelling. Difficulty breathing is a serious symptom that can indicate anaphylaxis, a severe and potentially life-threatening allergic reaction that necessitates immediate medical attention. Recognizing these symptoms is critical for timely treatment and management of allergic reactions, making this option the most accurate choice regarding allergic reactions.