There may be a relationship between cerebral aneurysm and hypertension, and there are two types of cerebral aneurysm: 1. congenital aneurysm caused by developmental abnormalities, mostly seen in adolescents, and cannot be excluded among elderly patients, but there is no connection between this kind of aneurysm and hypertension; 2. secondary aneurysm, secondary to other diseases, either hypertensive disease or arteritis. If the aneurysm is caused by hypertension, it is a result of poor control of long-term chronic hypertension, and the blood flow repeatedly flushes the vessel wall, resulting in lesions of the vessel wall and glassy changes of the elastic fibers inside, followed by the gradual outward expansion of the aneurysm under the blood flow, forming a microaneurysm. Microaneurysm is also the most common cause of cerebral hemorrhage. When blood pressure fluctuates drastically, it will easily rupture when it expands to a certain degree, leading to cerebral hemorrhage.