marq hit it on the head.
CTS or RSI are quite painful, and are not just a feeling of "coldness" in one's hands.
Having said that, if you do feel your hand getting cold, it's highly desireable to stop, exercise and rest for a few minutes. It's a warning sign that you're not getting enough blood and can be a predecessor of some real damage; ie CTS or RSI itself.
Mr Mephisto
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