Many people think hives or a rash are harmless, but when they happen with breathing problems, they can signal a life-threatening allergic reaction called anaphylaxis.
Hives are itchy, raised red patches that can spread quickly. Danger signs include trouble breathing, throat or chest tightness, swelling of the lips or tongue, rapid heartbeat, dizziness, or fainting.
Common triggers include foods, medications, insect stings, latex, and other allergens — even in people with no allergy history.
Doctors warn that symptoms can worsen rapidly. If hives appear with breathing difficulties, seek emergency help immediately and use an epinephrine injector if available.
A rash plus breathing problems should never be ignored — fast action can save a life.