Hives are usually harmless, but when combined with breathing difficulty, they may signal a life-threatening allergic reaction called anaphylaxis.
Warning signs include: shortness of breath, throat tightness, swelling of the face or tongue, rapid heartbeat, and dizziness.
Common triggers include foods, insect stings, medications, latex, and allergens. Symptoms can escalate quickly and become dangerous.
Seek emergency help immediately if hives occur with breathing problems and use an epinephrine injector if available.
