An aneurysm, as the name implies, is a growth in an artery. If it occurs in a blood vessel in the brain, it is called an intracranial aneurysm; of course, if it occurs in the aorta, it is called an aortic aneurysm, and the consequences of its rupture are just as serious. Here, I will mainly talk about intracranial aneurysm. Aneurysm is not terrible if it does not rupture, but once it ruptures, some times it cannot be rescued. Among cerebrovascular accidents, it ranks third after cerebral thrombosis and hypertensive cerebral hemorrhage. It can develop at any age, mostly in middle-aged and elderly people between 40 and 60 years old. The cause of intracranial aneurysms is not well understood. Most scholars believe that intracranial aneurysms are caused by local congenital defects in the walls of intracranial arteries and increased intraluminal pressure, and that hypertension, cerebral atherosclerosis, and vasculitis are related to the occurrence and development of aneurysms. Therefore, if you are one of the following groups of people, it is recommended that you add one more examination item to your physical examination if your economy allows: cranial CTA or cranial CE-MRA examination. 1. hypertension; 2. atherosclerosis; 3. family members who have had this disease; 4. those who feel tinnitus more often; 5. long-term mental stress; After an aneurysm occurs, it often develops further and the aneurysm slowly expands. Hypertension is an important acquired factor that leads to the gradual enlargement of aneurysms. Aneurysm rupture is different from imagined aneurysm burst (such as intraoperative aneurysm rupture). In this case, the bleeding is often very violent and the patient often falls into coma within minutes and dies rapidly due to brainstem damage. Anxiety, stress, agitation, sudden rise in blood pressure, urination and defecation, exertion, late pregnancy, childbirth, physical labor, and sexual intercourse are only predisposing factors for aneurysm rupture. In more cases, bleeding occurs suddenly without any obvious trigger. Therefore, a clear understanding of it, early detection of it, and early intervention before it grows and ruptures will have a good prognosis. Otherwise, it may be a bet with fate.