Carotid atherosclerosis is dangerous if left unchecked, and if treated aggressively is usually less dangerous. 1. Atherosclerosis of the carotid arteries is the accumulation of lipids in the lining of the carotid arteries with a yellow atheromatous appearance. It is associated with a decrease in the elasticity of the carotid arteries. Carotid atherosclerosis generally progresses slowly and is usually not dangerous if treatment is actively pursued. However, if left unchecked, aneurysms may form in severe cases, as well as separation of arterial clips, which in severe cases may lead to chronic cerebral ischemia resulting in cerebral atrophy. 2. The carotid artery, especially the internal carotid artery into the brain for atherosclerosis of the most common areas, lesions are concentrated in the bifurcation area of the blood vessels, will form atherosclerotic plaques caused by stenosis of the blood vessels, insufficient blood supply to the brain, local thrombosis, plaque rupture, debris dislodgement and so on resulting in cerebrovascular accidents. If carotid atherosclerosis occurs. Need to seek medical treatment as soon as possible to avoid causing serious complications.