What is a common sign of an allergic reaction to food?

A common sign of an allergic reaction to food is hives. Hives, or urticaria, are raised, itchy welts that can appear on the skin in response to an allergen. This immune response occurs because the body releases histamines and other chemicals that lead to skin inflammation. Hives can vary in size and can appear anywhere on the body, often as part of a more extensive allergic reaction. Recognizing hives as a symptom is crucial because they can indicate that a more severe reaction, such as anaphylaxis, might occur.

While the other options can sometimes be associated with different health conditions, they are not typical immediate signs of a food allergy. Shortness of breath can occur in allergic reactions, but it usually indicates a more severe issue like airway constriction rather than a standard symptom. A wound that won't heal is not linked to food allergies; it may signify chronic issues unrelated to allergic reactions. Swelling of the eyes can happen but is less common compared to hives when it comes to food allergies. Therefore, hives stand out as the most directly recognizable sign of an allergic reaction to food.