Harvard Heart Letter

Raynaud's: The big chill for fingers and toes

Raynaud's phenomenon is a sudden spasm of the blood vessels in the hands that blocks blood flow to the skin, causing pain. There are two main types of Raynaud’s. Secondary Raynaud’s and Primary Raynaud’s. It isn’t always easy to tell one type from the other. Your doctor will use your story, symptoms, and some blood and other tests to make a diagnosis.
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