Aneurysm, not a real tumor, is a localized abnormal expansion of the artery wall caused by abnormal changes in blood vessels, which is the weakest link of the blood vessel wall, just like a bulge formed in a car tire after prolonged wear and tear. The bulge of a car tire may burst when driving at high speed and lead to a car accident. Similarly, an aneurysm may rupture and bleed under the impact of blood flow and changes in blood pressure. Here, neurosurgeons will tell you about cerebral aneurysms. Cerebral aneurysm is one of the important causes of sudden death in adults, and once ruptured, the rate of death and disability is extremely high. According to statistics, among cerebrovascular accidents, the incidence of subarachnoid hemorrhage caused by cerebral aneurysm ranks third after cerebral infarction and hypertensive cerebral hemorrhage, but the mortality rate is the first. The biggest danger of cerebral aneurysm is rupture and bleeding, once ruptured and bleeding, about 12%-15% of patients lose their lives without reaching the hospital. If a ruptured cerebral aneurysm is not actively treated, it is more likely to rupture and bleed repeatedly, and the mortality rate will gradually increase. It is generally believed that after three consecutive ruptures and bleeding, the survival rate of patients with cerebral aneurysms drops to about 10%. In addition, even if the patient survives after aggressive treatment, about 25% of patients will have lifelong symptoms of brain tissue damage, such as hemiplegia, aphasia, incontinence and dementia. Therefore, early diagnosis and treatment of aneurysms is particularly important. Are there no signs of a brain aneurysm? Although brain aneurysms usually have no obvious symptoms before they rupture, there are some clues that can lead to “early detection”. Some patients may have a “warning headache” before a severe headache, which is a relatively mild headache that occurs 2 to 8 weeks before a bleed, and indicates a relatively high risk of re-rupture and bleeding. Once a severe headache occurs, think about the possibility of a ruptured aneurysm and bleeding. “Severe headache” is the most common clinical manifestation of a ruptured aneurysm, described by patients as “the most severe headache of my life”, accompanied by nausea and vomiting, and even loss of consciousness. Due to the gradual enlargement of the aneurysm and compression of the adjacent nerves, it may also cause some related symptoms, such as inability to open one eye, double vision, or paralysis of the affected arteriolar nerve, which is manifested by inability to raise the eyelid and protrusion of the eyeball. When the above symptoms appear, you should go to a large hospital in time to avoid missing the best time for treatment. Warm tip: To prevent cerebral aneurysm rupture, we should avoid violent fluctuation of blood pressure, because any factors that cause sudden increase of blood pressure can trigger aneurysm rupture. For example, a sudden increase in blood pressure due to mental tension, emotional excitement, exertion, violent head swing, bending over, getting up sharply, drinking alcohol, forceful defecation, lifting heavy objects, etc. can easily trigger aneurysm rupture and bleeding, which can threaten the patient’s life. The sudden drop in temperature and vasoconstriction cause a sudden rise in blood pressure, and the chance of cerebral aneurysm rupture will increase accordingly. Generally speaking, winter is the most frequent period for ruptured cerebral aneurysm, but the large temperature difference between indoor and outdoor due to air conditioning in summer is also becoming one of the causes that cannot be ignored.