Vascular stenosis refers to the smaller diameter of blood vessels due to atherosclerosis, swelling compression and other reasons, which may cause symptoms such as insufficient local perfusion. Vascular stenosis can be divided into arterial stenosis, venous stenosis, arterial stenosis is generally manifested as insufficient perfusion, venous stenosis can be manifested as impaired blood return, bruising performance. Arterial stenosis is clinically more common is atherosclerosis, can be involved in the heart of the coronary artery, cerebral arteries, lower limb arteries, etc., arteries due to lipid deposition, the diameter of the tube becomes smaller, may cause local blood supply is insufficient. Coronary heart disease is caused by coronary artery atherosclerosis resulting in narrowing of the lumen, resulting in myocardial ischemia leading to angina pectoris or even myocardial infarction, cerebral artery involvement can cause cerebral infarction, etc., depending on the location of the infarction, there are corresponding symptoms such as slurred speech, limb movement disorders and so on. Atherosclerotic occlusive disease of the lower limbs can lead to intermittent claudication, rest pain and even lower limb ulcers and other ischemic manifestations. Tumor compression and thrombus blockage can also lead to vascular stenosis, which can cause local ischemia or bruising symptoms. For example, thoracic tumor invades and compresses superior vena cava, leading to blood return obstacle in head and neck, arm and chest, and swelling of head, face and upper limbs, dyspnea and so on. Deep vein thrombosis of the lower limbs can lead to obstruction of venous return and swelling of the leg on the affected side.