The symptoms are suggestive of muscle strain
cramps after exercise. Sudden calf
pain that show up during physical activity, such as walking, are usually a sign of arterial insufficiency(peripheral artery disease). That means the arteries aren't able to supply the calf
muscles with enough blood and oxygen to meet their needs. This usually arises from thrombus or emboli formation. The pain from PAD is brought on by exercise, and relieved by rest.