Which of the following is a sign of a potential allergic reaction in patients?

The presence of symptoms such as hives, swelling, difficulty breathing, or gastrointestinal distress indicates a potential allergic reaction in patients. These manifestations are typical responses to allergens, where the immune system overreacts to a substance that it mistakenly identifies as harmful. Hives, also known as urticaria, are raised, itchy welts on the skin. Swelling, or angioedema, can occur in various tissues and is particularly concerning if it affects the throat or tongue, potentially leading to obstructed breathing. Difficulty breathing is a critical sign that may indicate respiratory distress or anaphylaxis, a severe and life-threatening allergic reaction. Gastrointestinal symptoms, such as nausea, vomiting, or abdominal pain, can also arise due to dietary allergens. Recognizing these symptoms promptly is essential in order to manage any allergic reactions effectively, ensuring patient safety and appropriate medical intervention.