Hives
From Health Encyclopedia
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Facts
- The medical term for hives is urticaria (say: ur-tuh-kar-ee-uh).
- A common form of allergic reaction that causes raised red skin welts.
- Hives go away usually within 24 hours.
- In some cases, the cause of the hives is an allergen such a food or drug.
- One hallmark of hives is their tendency to change size rapidly and to move around, disappearing in one place and reappearing in other places, often in a matter of hours.
- In about one third of cases, the cause of hives is unknown.
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