What are the hallmark signs of anaphylaxis?

• A. Chronic cough and wheezing only
• B. Fever with rash
• C. Localized swelling only
• D. Rapid onset airway swelling, difficulty breathing, and hypotension

Answer: (D)

This item tests recognizing the hallmark signs of anaphylaxis, a rapid, life-threatening systemic allergic reaction. The defining feature set is sudden airway swelling that can block or severely narrow the airway, accompanying breathing difficulties such as wheeze or shortness of breath, and a drop in blood pressure (hypotension) that can lead to shock. These elements appear quickly after exposure to the allergen and reflect a whole-body reaction, not just a localized issue. In many cases, skin symptoms like hives or flushing may also be present, but the critical combination is airway compromise with breathing trouble and low blood pressure, which is what makes this scenario anaphylaxis. Other descriptions—chronic cough and wheezing alone, fever with rash, or swelling confined to one area—do not capture the rapid systemic involvement and potential for cardiovascular collapse that define anaphylaxis, so they aren’t the hallmark signs.