By Heather Brannon, MD, About.com Guide
Created: June 17, 2009
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
Urticaria is the medical term for the condition we call hives, and it can be classified as acute or chronic depending on how long the rash has been present. Acute hives last for less than 6 weeks. The majority of hives cases fall into this category.
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