How long a stenosis lasts 100% without stenting depends on what kind of blood vessel the stenosis is. The human body is full of blood vessels, and many of them have anastomotic branches to communicate with each other. If the stenosis is not 100% in a vital organ, the blood can be supplied by its transportation branch without affecting the health. If the stenosis of intracranial blood vessels is 100%, it will cause ischemic infarction of brain tissue if there is no other blood vessel to replace its blood supply. Whether the life is affected depends on the scope and location of the cerebral infarction, and if it is a large cerebral infarction or in the vicinity of the brain stem, it will soon lead to respiratory apnea and jeopardize the life. If the stenotic vessel is a cardiac vessel, it also depends on whether it is a left or right coronary artery. A 50% stenosis in the left coronary artery and a 75% stenosis in the right coronary artery are already indications for stenting, while a 100% stenosis is not an indication for stent implantation, and requires bypass surgery, otherwise it can lead to myocardial infarction, and a large heart attack can be life-threatening. When there is a blood vessel stenosis, it is necessary to go to the hospital for examination and treatment in time to avoid delaying the condition.