Cholinergic urticaria

Cholinergic urticaria (CU) is a type of physical urticaria (or hives) that appears when a person is sweating or their core body temperature increases. Cholinergic urticaria (CU) is a type of physical urticaria (or hives) that appears when a person is sweating or their core body temperature increases. CU typically presents with a number of small, short-lasting hives but may also involve cutaneous inflammation (wheals) and pain which develops usually in response to exercise, bathing, staying in a heated environment, or emotional stress. Although the symptoms subside rapidly, commonly within 1 hour, CU may significantly impair quality of life, especially in relation to sporting activities.