My daughter out of nowhere has a hive break out,nothing new introduce,not sick ,or allergic to food.i don't know what else can be.shes getting a test next week for blood and allergies but i'm going insane as is a new thing for her?

Hives: Hives are urticaria. Chronic idiopathic urticaria and chronic spontaneous urticaria are not triggered by identifiable factors. is rarely a sign of another underlying disease. Inducible urticaria — Urticaria can be triggered by physical stimuli, such as heat, cold, pressure applied to the skin, exercise, water, vibration, and sunlight. I have seen hives from emotional stress.