What are the signs of an allergic reaction?

The signs of an allergic reaction can manifest in various ways, but the most critical indicators often include hives, swelling, difficulty breathing, and in severe cases, anaphylaxis.

Hives are raised, red welts on the skin that can occur quickly after exposure to an allergen. Swelling, especially around the face, lips, or throat, is indicative of a serious reaction, potentially obstructing the airway. Difficulty breathing is a critical sign that the respiratory system may be compromised due to an allergic reaction, which can escalate to anaphylaxis—a life-threatening condition that requires immediate medical attention. Recognizing these symptoms is vital for prompt intervention, as the severity of the reaction can increase rapidly.

Other choices may mention symptoms such as smiling or slight headaches, which do not relate to allergic reactions. Similarly, nausea or slight dizziness can be associated with various conditions but are not definitive signs of an allergic reaction. Understanding the correct signs helps ensure that individuals can act appropriately during a medical emergency.