Which is a potential sign or symptom that may suggest an allergic reaction?

Hives and itching are classic signs of an allergic reaction, indicating the body’s immune response to an allergen. When an individual encounters a substance that their immune system identifies as a threat, histamines and other chemicals are released, leading to symptoms such as urticaria (hives) and pruritus (itching). These symptoms arise as a result of the skin’s inflammatory response and are often among the first observable signs of an allergic reaction, helping healthcare providers identify the condition quickly for appropriate intervention.

The other options, while they can indicate various medical conditions, are not typically associated with allergic reactions. Pallor and weakness could point to a myriad of issues including anemia or shock, fever and chills often suggest infection, while weight loss might indicate chronic disease or malnutrition. Understanding these distinct presentations enables healthcare professionals to differentiate between allergic responses and other health concerns effectively.