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Causes and Risk Factors for Hives

Hives usually are caused by an allergic reaction. However, in some cases, there is no clear cause for the rash Urticaria can result when certain skin cells (called "mast cells") release histamine or other chemicals into the blood. These substances may cause blood vessels to leak fluid and hives to form.

People with a family history of hives and those who have had a previous allergic reaction are at increased risk for developing urticaria.


Hives can b...Read the full article