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It is possible that you may be suffering from disease of the arteries in the legs which causes the severe pain
. Does that leg feel cooler to touch than the other leg. Is there less hair growth on that leg. How long do you walk before the leg starts paining. What medication are you on. These may be symptoms of Peripheral vascular disease
. Kindly show yourself to your Doctor, get your blood sugar tested, and also get a doppler of your affected leg if requested by your Doctor.