With the continuous improvement of living standard and medical technology, intracranial aneurysm is getting more and more attention, and Zhao Benshan, a famous artist in China, suffered from intracranial aneurysm, which also ruptured and bleeding. How does intracranial aneurysm cause? Is there any way to avoid intracranial aneurysm? First of all, according to the current medical level, there is no clear statement on how intracranial aneurysm is caused, and to be direct, it is not very clear. However, there are several factors related to the formation of intracranial aneurysm: 1. Congenital factors: It refers to the formation at birth. According to anatomy, the middle layer of intracranial artery wall lacks elastic fiber and smooth muscle, but the blood flow it has to bear is very large, and there is no corresponding tissue support around it, so the impact it receives at the bifurcation or bend of the blood vessel is very large, if the intracranial artery has congenital abnormal development, it is easy to develop into aneurysm at the bifurcation or bend of the blood vessel. 2.Blood flow impact: As mentioned in the previous congenital factors, the bifurcation or bend is vulnerable to blood flow impact and aneurysm will appear. 3.Arteriosclerosis: Arteriosclerosis is a pathological change that is very likely to occur in middle-aged and old people at present. If the artery is hardened, then its arterial wall elastic fibers break and disappear, and it will cause occlusion of the arterial nutrient vessels and make the vessel wall degenerate, so that the vessel will be subjected to more pressure, and this condition will usually form a pike aneurysm. 4. Infection: Infected aneurysms account for about 4% of all aneurysms and are relatively rare. Infections in all parts of the body can take the form of small emboli disseminated through the bloodstream and lodged in the weekend branches of the cerebral arteries, with a few emboli lodged in the bifurcation of the arteries. Infected or fungal aneurysms can also be caused by external erosion of the arterial wall by skull base bone infections, intracranial abscesses, and meningitis. The shape of infected aneurysm is mostly irregular. 5.Trauma: Most of the traumas form pseudoaneurysms, and very few of them also form true aneurysms. From the above analysis, we can see that, except for the first and second points that cannot be controlled by human, we can still prevent and control atherosclerosis, infection and trauma to avoid intracranial aneurysm.