Though it is not clear what causes cold urticaria, it appears that some people have hypersensitive skin cells. This means that their skin cells are more sensitive than a normal person's skin cells to things like temperature. This may be a result of either an inherited trait or an illness (for example, a virus). Since exposure to cold begins the immune response that releases histamine and other immune system chemicals, the skin may become itchy and exhibit redness and other symptoms.
What causes Chronic cold urticaria?
Though it is not clear what causes cold urticaria, it appears that some people have hypersensitive skin cells. This means that their skin cells are more sensitive than a normal person's skin cells to things like temperature. This may be a result of either an inherited trait or an illness (for example, a virus). Since exposure to cold begins the immune response that releases histamine and other immune system chemicals, the skin may become itchy and exhibit redness and other symptoms.