intermittent vascular (or arterial) claudication (latin: "claudicatio intermittens") most often refers to cramping pains in the buttock or leg muscles, especially the calves. it is caused by poor circulation of the blood to the affected area, called peripheral arterial disease. the poor blood flow is often a result of atherosclerotic blockages more proximal to the affected area; individuals with intermittent claudication may have diabetes — often undiagnosed. another cause, or exacerbating factor, is excessive sitting (several hours), especially in the absence of reasonable breaks, along with a general lack of walking or other exercise that stimulates the legs.