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Raynaud s is described as Raynaud s disease , Raynaud s phenomenon , or Raynaud s syndrome . Although some people carelessly use these terms interchangeably, these aren t all the same thing. It helps to know a little history. Raynaud was a French medical student in the late 1800 s who had to write a thesis as one of the requirements for graduation. He decided to write about the color changes he saw in the hands of women waiting for the streetcar on cold winter days.