Signs of a severe allergic reaction (anaphylaxis) that require immediate action include which of the following?

• A. Trouble breathing, swelling of face or throat, hives, dizziness, or faintness.
• B. A mild runny nose.
• C. Slight thirst.
• D. A minor headache.

Answer: (A)

Recognizing a severe allergic reaction that can become life-threatening means spotting signs that affect breathing and circulation. Trouble breathing or any difficulty getting air in signals the airway is at risk. Swelling of the face or throat can quickly block air passage. Hives show a widespread reaction, and dizziness or faintness suggests a drop in blood pressure. When these symptoms appear, it’s an emergency: act quickly by calling emergency services and using an epinephrine auto-injector if one is prescribed and available. Seek further medical care even if symptoms seem to improve after the epinephrine.

Milder symptoms like a mild runny nose, slight thirst, or a minor headache aren’t indicators of anaphylaxis and don’t warrant the same immediate emergency actions.