Intermittent claudication is when the patient has no obvious discomfort when not walking, but as soon as he walks, one or more discomforts such as soreness, pain, numbness, etc. occur in the lower limbs, mainly pain and numbness, so that he has to stop and rest, and after a period of rest this discomfort disappears and he can continue walking again. Clinically, we call this symptom intermittent claudication. The severity of intermittent claudication is usually judged by the distance of claudication and the time of relief. The claudication distance is the walking distance from the beginning of walking to the appearance of pain, and a serious patient can experience significant discomfort after walking 50 to 100 meters. The pain relief time is the time from pain to no pain called pain relief time after pain appears and pain is relieved by rest. The relief time for general patients is 2 to 5 minutes. There are two main causes that can cause intermittent claudication. One is intermittent claudication of vascular origin, which should be mainly caused by ischemia of the lower limbs. The most common diseases are lower extremity atherosclerosis occlusive disease and thrombo-occlusive vasculitis, and the severity of intermittent claudication is proportional to the degree of lower extremity ischemia, and the painful site of intermittent claudication is related to the site of vascular sclerosis occlusion. One type of intermittent claudication is neurogenic, mainly due to compression of the nerves innervating the lower limbs. The most common disease is lumbar spinal stenosis, and although the severity of intermittent claudication does not accurately reflect the degree of lumbar spinal stenosis, once this symptom occurs, it often indicates that the nerve is more heavily compressed. Regardless of the cause of intermittent claudication, if it occurs, it indicates that the disease has become more serious and should immediately come to the hospital for medical attention. The vascular department and orthopedic department are the departments where such patients must be seen, and arterial ultrasound and lumbar spine MRI are the tests that must be done for such patients.