Unruptured and small cerebral aneurysms do not affect natural life expectancy, but when they rupture, they can be life-threatening and cause death within a short period of time. Cerebral aneurysms are abnormal tumor-like projections of the cerebral blood vessels. The cause of the aneurysm is unknown and may be related to congenital dysplasia, infection, atherosclerosis, trauma and other causes. When the aneurysm is small, there may be no obvious clinical symptoms; when it compresses the surrounding tissues, symptoms of impaired neurological function may appear; when the aneurysm ruptures, clinical manifestations such as increased intracranial pressure and impaired consciousness may appear. The prognosis of small cerebral aneurysms is better, and most of them do not affect the natural life span. However, as the aneurysm grows and ruptures and bleeds, the condition can be life-threatening and cause the patient to die within a short period of time. Even if some of the patients can save their lives through treatment, there will be different degrees of sequelae, which will affect the survival time of the patients to a certain extent. Therefore, patients with aneurysms should consult a doctor in time and be treated under the guidance of a doctor to avoid delaying the condition and causing serious consequences.