For intermittent claudication in one leg, an ultrasound of the lower limb can be performed first to determine if there is any arterial stenosis or occlusion by observing the blood flow in the lower limb, which in turn can determine if there is atherosclerosis causing lower limb atherosclerosis or if there is thrombo-occlusive vasculitis. The diagnosis can also be established by angiography if necessary. If vascular causes are ruled out, X-rays, MRI examinations, etc. can be performed at an orthopaedic department to determine if there is a herniated disc or spinal stenosis.