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Cold urticaria, or cold contact urticaria, is a subtype of physical urticaria (table 1) [1-3]. The physical urticarias are forms of inducible urticaria, in which there is a specific and definite stimulus that triggers the development of symptoms. Cold urticaria is characterized by pruritic wheals(hives) and/or angioedema due to cutaneous mast cell degranulation and release ofproinflammatory mediators after cold exposure of the skin. Triggers include skin contact with coldobjects, cold liquids, and cold air. The underlying pathophysiology is largely unknown but is likelyto involve immunoglobulin E (IgE)-mediated mast cell activation [4,5].Cold urticaria is reviewed here. Other urticaria disorders, including acute and chronic spontaneous urticaria and other forms of inducible urticaria, including physical urticaria, are discussed separately.