Raynaud's disease, also called Raynaud's phenomenon, causes the hands and fingers to become numb and abnormally cold during periods of stress or exposure to cold. While it is normal for the hand to become numb and cold in low temperatures, people with Raynaud's have a more extreme reaction. In severe cases, people with the condition can develop sores or gangrene. To prevent tissue damage, doctors may encourage people to wear gloves and to avoid exposing their hands to cold temperatures. Sometimes, surgery can improve extreme cases of Raynaud's disease.

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