What Internal Diseases Cause Hives?

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Hives are raised, often itchy, red welts on the surface of the skin. They are usually an allergic reaction to food or medicine.

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Causes, incidence, and risk factors

When you have an allergic reaction to a substance, your body releases histamine and other chemicals into your bloodstream. This causes itching, swelling, and other symptoms. Hives are a common reaction, especially in people with other allergies such as hay fever.

When swelling or welts occur around...

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