What are the signs of a severe allergic reaction?

The signs of a severe allergic reaction, also known as an anaphylactic reaction, can manifest in a range of symptoms that may be life-threatening if not addressed promptly. The correct answer highlights key indicators of this severe response: swelling, particularly in areas such as the face or throat, difficulty breathing which can arise from airway constriction, and the appearance of rash or hives on the body. These symptoms collectively suggest a systemic response to an allergen that requires immediate medical intervention due to the potential for respiratory failure or shock.

The other options do not accurately represent the severity associated with a systemic allergic reaction. Minor swelling and rash typically indicate a milder allergic response and do not encompass the critical symptoms that characterize a severe reaction. Likewise, itching and mild discomfort may occur during less severe reactions. Fever and chills are indicative of an infection or other immunological response, rather than an allergic reaction. Recognizing the symptoms of a severe allergic reaction is crucial to ensure timely and appropriate care.