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Raynaud phenomenon
- This test checks for Raynaud phenomenon, a condition in which cold or stress can reduce blood flow to your fingers or toes for a while. Learn ... is used to find out if you have Raynaud phenomenon . Raynaud phenomenon, also known as Raynaud disease or Raynaud syndrome, ... deeper in the body. But when you have Raynaud phenomenon, the blood vessels in your hands and feet ...