Peripheral Arterial (Vascular) Disease (or PAD/PVD), is a common condition where narrowed arteries in the leg or legs prevent regular blood flow. This usually causes pain and/or cramping in the muscles of the hip, thigh or calf when walking or exercising. The pain can go away when resting, but will return with exercise and movement. If left untreated, the narrowed arteries prevent blood flow to the leg or legs, and can essentially “choke” the leg. This can cause the skin to change color, difficulty walking, ulcers and sores on the leg and foot, and lead to gangrene and possible amputation.