Stenosis of the left internal carotid artery at segment c2-3 is relatively serious, but its severity is determined by the degree of narrowing of the artery. This is because the narrowing of the carotid artery affects the operation of blood, which leads to insufficient perfusion of brain tissue. Once ischemia occurs, it is easy to suffer from hypoxia and even fainting and other phenomena. Internal carotid artery c2~3 segmental stenosis refers to the narrowing of the internal carotid artery corresponding to the cervical 2 vertebrae to the cervical 3 vertebrae, and there are many reasons for this stenosis, such as plaque formation caused by hyperlipidemia, hyperglycemia, obesity and so on. When left internal carotid artery c2~3 segment stenosis occurs, it is recommended to consult the doctor in time, and carry out the corresponding imaging examination, in order to clarify the extent of the disease, and carry out targeted treatment.