Which of the following is a common sign of anaphylaxis?

A common sign of anaphylaxis is a skin rash, specifically urticaria or hives, which often appears due to the rapid release of histamine and other mediators from mast cells and basophils. This rash can manifest as red, itchy welts on the skin and is frequently accompanied by other symptoms such as swelling, difficulty breathing, or gastrointestinal distress as part of a systemic allergic response. Recognizing this skin reaction is vital for timely diagnosis and treatment of anaphylaxis, which can progress rapidly and require immediate intervention.

Chest pain, high fever, and headache are not typical hallmarks of anaphylaxis. While chest pain can occur in some cases due to associated respiratory distress, it is not a primary indicator of anaphylaxis. High fever is not a typical feature of this acute allergic reaction, and headache may arise from anxiety or other causes, but it does not signify anaphylactic shock. Understanding the classic signs, particularly the distinctive skin manifestations, is crucial for emergency management in suspected cases of anaphylaxis.