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A member asked:
What's happening chemically in the body when you break out in hives and severe itching/stinging from heat? cholinergic urticaria. how is this happen?
A doctor has provided 1 answer
Vasoactive Amines: Your body is more reactive to the heat and releases chemicals that cause urticaria. This answer in part depends on the rest of your health. Your body releases these chemicals known as vasoactive amines that cause the swelling and itching that you see with your urticaria
Answered 12/26/2016
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