At present, people have a certain awareness of myocardial ischemia (coronary heart disease), and they will seek medical treatment earlier once they have chest pain, and doctors will pay attention to it and give treatment earlier. However, lower limb ischemia is not yet recognized by the majority of patients, which is very dangerous and has a high disability rate, and the 5-year survival rate of patients who have their limbs amputated due to lower limb ischemia is only 25-50%. The typical symptom of lower limb ischemia – intermittent claudication, that is, leg pain after walking for a while, can be relieved by resting for a moment, and then walking again, has a low incidence of symptoms, and often come to the clinic only when there is rest pain or night pain or even long-term foot wounds that do not heal, at which time the difficulty of treatment The difficulty of treatment increases significantly, the cost of treatment increases significantly, the effect of treatment decreases and the risk increases. Therefore, patients and family members of lower limb ischemia should pay high attention to it. Lower limb ischemia prone people: diabetes, hypertension, hyperlipidemia, coronary heart disease, cerebrovascular disease and long-term smokers. Lower limb ischemia symptoms: 1. intermittent limb claudication, rest pain, night pain. 2.Coldness and fear of cold in the affected limb. 3.The color of the affected limb is white or blotchy. 4.The sweat hair of the affected limb is lost and hairless. 5.Wound on the foot does not heal in the last period.