WebMD Answers
Poor circulation to the legs, which results in inadequate oxygen to the muscle tissue, can cause severe pain in the muscle (sometimes known as claudication pain or intermittent claudication) that occurs with walking or exercise. This commonly occurs in the calf muscles. While the pain feels virtually identical to that of a severely cramped muscle, the pain does not seem to be a result of the actual muscle cramping. This pain may be due to accumulation of lactic acid and other chemicals in the muscle tissues. It's important to see your doctor if you have pain like this.
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