Poor blood circulation?

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I don't know how one can tell that it "feels like" one has blood circulating difficulties. I would judge that the feeling that most folks get from sitting one's foot for a long period of time is due to nerve compression, not circulation, and I don't know anyone who would tie a string around his finger so tightly so as to cut off circulation. So, in my view, what you need is a diagnosis prior to a suggestion of a cure. That would most likely mean going to see a doctor.