What Causes Hives and Angioedema?

Hives and angioedema occur when histamine is released from special cells found along the skin’s blood vessels. In response to histamine, plasma leaks out from these blood vessels in the skin. Allergic reactions to things like foods, medicines, insect stings and sunlight exposure can cause histamine release. Sometimes it is impossible to determine exactly why hives have formed.

Author
Dr. Summit Shah

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