What is a common sign of anaphylaxis?

Swelling of the airway or face is a hallmark sign of anaphylaxis, which is a severe allergic reaction that can be life-threatening. In anaphylaxis, the body releases a flood of chemicals in response to an allergen, leading to rapid swelling and inflammation. This can occur in various tissues, particularly in areas like the face, lips, throat, and tongue, which can obstruct the airway, making breathing difficult.

Recognizing this sign is critical for emergency responders, as it can progress quickly and require immediate intervention, such as administering epinephrine to alleviate symptoms. Other signs of anaphylaxis may include hives, difficulty breathing, and gastrointestinal distress, but the airway and facial swelling are especially urgent, as they indicate a potential for airway compromise.