Internal carotid aneurysm c6 segment cerebral aneurysm 3mm is very serious. This is because the diameter of cerebral aneurysm is above 3mm, the risk of rupture and bleeding is relatively high, once the rupture and bleeding may endanger the patient’s life, the first time the cerebral aneurysm rupture 1/3 of the patients with life-threatening, the second time again rupture and bleeding this ratio is as high as 2/3. Therefore, if the diameter of cerebral aneurysm is more than 3mm, it is recommended to deal with the aneurysm in time under the premise of meeting the surgical indications, and according to the specific conditions of the patients, follow the doctor’s instructions to choose craniotomy to deal with the aneurysm of cerebral aneurysm or interventional surgery to deal with cerebral aneurysm. Patients with cerebral aneurysm are recommended to go to the hospital in time, and be actively treated under the doctor’s guidance, so as to avoid delaying the condition, which may lead to serious consequences. Normally, it is necessary to control the blood pressure, maintain emotional stability, and do not stay up all night.