What are the signs of an anaphylactic reaction?

Anaphylaxis is a severe and potentially life-threatening allergic reaction that can occur rapidly after exposure to an allergen. The signs and symptoms are critical in recognizing anaphylaxis and initiating appropriate treatment.

Swelling, also known as angioedema, typically occurs in the face, throat, or tongue, and can lead to difficulty breathing due to airway obstruction. Hives, or urticaria, present as raised, itchy welts on the skin and are a common manifestation of an allergic response. Difficulty breathing may arise from bronchospasm, which narrows the airways and makes it hard to gas exchange properly.

Recognizing these symptoms is vital for prompt intervention, often involving the administration of epinephrine to reverse the severe effects of anaphylaxis. The other options listed present symptoms that are not characteristic of an anaphylactic reaction, making them less relevant in this context.