Patients previously classified as having chronic idiopathic or "ordinary" urticaria are now divided into two groups: 40% to 50% with chronic autoimmune urticaria (CAU) and the remainder with ...

A search for thyroid auto-antibodies is appropriate for all chronic urticarias not responding to first-line therapies with antihistamines, especially when autoimmune urticaria is suspected.

Medically reviewed by Jurairat J. Molina, MD Acute urticaria (hives) is a common skin condition that affects up to 20% of people at some point in their lives. It can transition into chronic urticaria ...

How urticaria occurs Experts say that a reaction to cold can occur in both perfectly healthy people and those with serious ...