Aneurysms growing in the cerebral arteries are called intracranial aneurysms, which are commonly referred to as aneurysm-like expansions of cerebral blood vessels. There are many types of intracranial aneurysms, but common aneurysms are usually congenital, due to certain structural defects in the development of the patient’s blood vessels, but defects do not necessarily mean that aneurysms will grow, so there is no need to worry too much. Don’t misunderstand, the congenital nature mentioned here is not something that is present at birth or necessarily inherited from parents to their children. The greatest risk of an aneurysm is rupture and bleeding. Once ruptured, the risk of death or disability is extremely high, and about 1/3 of patients will die on the spot. Even if the patient survives, the risk of re-rupture after an aneurysm rupture is so great that most patients will die within two years if the aneurysm is not treated. Aneurysm rupture typically presents as a subarachnoid hemorrhage, a specific type of brain hemorrhage in which the patient presents with a severe headache and frequent vomiting. A dangerous tendency is for many patients, and even physicians, to treat subarachnoid hemorrhage with medication only for the hemorrhage, without examining the cause of the hemorrhage, thus losing the opportunity to treat the aneurysm in a timely manner, and the patient often dies during or after discharge from the hospital with a recurrence of hemorrhage. Once a subarachnoid hemorrhage occurs for no apparent reason, it is important to have an early cerebral angiogram and, if it is an aneurysm, to target the aneurysm for treatment as soon as possible. For aneurysm treatment, there are mainly: 1) microsurgery to clip the aneurysm, which is relatively less expensive but relatively more traumatic; 2) interventional treatment – embolization of the aneurysm with a special spring ring, which is less traumatic but relatively more expensive. Finally, two points should be emphasized: 1. Once a brain hemorrhage occurs, especially subarachnoid hemorrhage, the cause of the hemorrhage must be found, rather than just treating the hemorrhage. 2.Aneurysm treatment should be followed up on time as instructed by the doctor.