Cerebrovascular aneurysm will grow slowly. In mild cases, there may be no obvious symptoms or intermittent headaches; when the aneurysm gradually increases in size, it may lead to rupture of the blood vessel, thus causing serious symptoms such as subarachnoid hemorrhage. Cerebrovascular aneurysm can grow slowly. At the initial onset, if the aneurysm is small, it may not have any symptoms, and some patients may have episodic headache. If the patient is not diagnosed and treated in time, the cerebral aneurysm may increase gradually due to high blood pressure and so on. In serious cases, the aneurysm may rupture and cause subarachnoid hemorrhage, and a large amount of hemorrhage may cause cerebral hernia and death. To sum up, cerebral aneurysm has certain risks, when aneurysm is found, it is necessary to pay attention to it, go to the hospital in time, assess the situation of cerebral aneurysm, and choose the best treatment plan according to the patient’s condition.