What are the signs of a severe allergic reaction?

A severe allergic reaction, often referred to as anaphylaxis, is characterized by specific and critical signs that require immediate medical intervention. Difficulty breathing indicates that the airways are narrowing or becoming obstructed, which can occur due to swelling in the throat or other respiratory tissues. This swelling is a result of the body's allergic response, leading to increased vascular permeability. Urticaria, or hives, is a skin manifestation of the allergic reaction where raised, itchy welts appear on the skin, further signaling an abnormal immune response. The combination of these symptoms suggests that the body is experiencing a widespread reaction, impacting both the respiratory system and the skin, making it essential to recognize and respond swiftly to prevent life-threatening outcomes.

In contrast, the other options describe symptoms that may result from various conditions but do not specifically indicate a severe allergic reaction. Thus, they are not key indicators of anaphylaxis.