Angioedema ; hives: Sometimes it's not possible to pinpoint the cause of hives and angioedema, especially when these conditions become chronic or recur.Hereditary angioedema is a rare inherited form of the condition. It's related to low levels or abnormal functioning of certain blood proteins (c1 inhibitors) that play a role in regulating how your immune system functions. Get an allergy test and blood work test.
Answered 9/28/2016
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