It is now past the beginning of winter and has officially entered winter. In this cold season, as the temperature drops, it becomes a high incidence of vascular diseases. Often manifested in the cold extremities, especially the cold lower extremities, by increasing clothing can not ensure the warmth of the hands and feet, and even pain in the lower extremities, weakness, walking for a period of time must rest for a period of time to continue walking, the specialist called “intermittent claudication”. These phenomena cannot simply be blamed on the cold weather, especially for some of our middle-aged and elderly friends. When there is coldness in the lower limbs, weakness, intermittent claudication, or even pain in the limbs, it is important to check for vascular problems. Lower limb atherosclerotic occlusive disease is the manifestation of atherosclerotic occlusive disease in the limbs. Atherosclerosis manifests itself in the cardiovascular aspect as myocardial infarction and cerebral infarction, causing insufficient blood supply to the heart and insufficient blood supply to the brain, and is highly valued. However, ischemia and lesions in the limbs are often not taken seriously at the initial stage, and many cases are clinically diagnosed at an advanced stage, which makes treatment very difficult and the prognosis is often not very good. Symptoms such as coldness, weakness and intermittent claudication of the lower limbs caused by initial atherosclerosis are often attributed to cold weather and the natural fear of cold in old age. Thus, the best time for treatment is missed. Therefore, when we feel cold in the lower extremities and cannot keep warm no matter how much we wear, it is time to consider whether there is a peripheral vascular problem. Some simple self-examinations and non-invasive examinations in the hospital can lead to a very clear conclusion. Self-examination includes simple visual examination and palpation, i.e. observing the nutritional status of the lower extremities: whether there is dry skin, hair loss, skin malnutrition, etc.; palpation includes touching the temperature of the lower extremities and the pulsation of the arteries, such as the dorsalis pedis artery and the posterior diameter artery. Hospital tests such as arterial ultrasound and Doppler vascular non-invasive examination are very simple and direct ways to check the blood vessels. Atherosclerotic occlusive disease can often be treated with good results in the early stages, but in the later stages, severe atherosclerosis may cause occlusion of blood vessels, resulting in lifelong disability due to lack of blood supply to the limbs.