What causes poor circulation?

What causes poor circulation?

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There are many reasons for poor circulation. One can be Vasculitis, meaning inflammation of the blood vessels to the area. There is also a syndrome called Raynaud's syndrome, where the blood vessels in the fingers when it's cold, spasm and none of blood gets through to the area and thus the oxygen can't get to that area. Poor circulation can also be from a block of the blood vessels, from a mobilization or just use.