What are chronic hives (chronic idiopathic urticaria)?

What are chronic hives (chronic idiopathic urticaria)?

Chronic hives are itchy, raised, red bumps or welts that appear on your skin at least twice per week. These welts, also called wheals, are chronic when they last more than six weeks.

You may hear this condition called chronic idiopathic urticaria:

• Chronic: A symptom or condition that persists even with treatment.
• Idiopathic: The symptom or condition occurs for no known reason. It comes on suddenly.
• Urticaria: The medical term for hives, pronounced ur-tik-CARE-ee-uh.