Overview

Hives — also known as urticaria (ur-tih-KAR-e-uh) — is a skin reaction that causes itchy welts, which range in size from small spots to large blotches. Hives can be triggered by many situations and substances, including exposure to certain foods or medications.

Angioedema can arise with hives or alone, causing swelling in the deeper layers of your skin, often around your face and lips. Hives and angioedema are common. Most times, they are harmless, clear up within in a day and don't leave any lasting marks, even without treatment.

Hives and angioedema are usually treated with antihistamine medication. Angioedema can be life-threatening if swelling causes your throat or tongue to block your airway.