The intervention of stents for middle artery stenosis may carry the risk of arterial plaque dislodgement, arterial entrapment, and reperfusion cerebral hemorrhage. 1. Arterial plaque detachment: like carotid artery stenosis is caused by atherosclerosis, followed by congenital causes and vasospasm. In the process of stent intervention, it is easy to cause plaque rupture and dislodgement, which may cause cerebral infarction and even death. 2. Arterial entrapment: The phenomenon of forming a false lumen of blood vessels after the rupture of the vessel’s lining is called arterial entrapment, which is an extremely dangerous phenomenon that may cause stroke and even death. 3. Reperfusion cerebral hemorrhage: In case of carotid artery stenosis, the blood flow into the brain may suddenly increase after stent intervention, leading to cerebral hemorrhage and even death. Stent intervention may also have in-stent angiogenesis, arterial perforation, mechanical operation failure and other dangers occur, so patients are required to choose a hospital with authority before stent intervention and choose the stent with qualified quality. After the operation, patients should pay attention to rest, do less high-intensity activities, have a reasonable diet, have regular checkups, and go to the hospital in time if there is any discomfort.