Day: June 15, 2025

Hives — also called urticaria (ur-tih-KAR-e-uh) — is a skin reaction that causes itchy welts. Chronic hives are welts that last for more than six weeks and return often over months or years. Often, the cause of chronic hives isn’t clear. The welts often start as itchy patches that turn into swollen welts that vary in size.