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How do doctors determine the cause of an aneurysm?

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Since little is known about the reasons why some people develop aneurysms and other don't, doctors find it difficult to determine the cause of an aneurysm, according to About.com. Patients can inherit aneurysms from genes, and high blood pressure and cigarette smoking appear to predispose people to aneurysms.

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Aneurysms, which are weak areas on the walls of blood vessels and often found in arteries, can cause symptoms including lightheadedness, dizziness, nausea, and blurry or double vision, notes About.com. High blood pressure can cause aneurysms to rupture and bleed in the brain. A sudden terrible headache, far worse than normal as well as neck pain and stiffness can indicate an aneurysm.

As an aneurysm grows and pushes against blood vessels, it can create double vision and pain around the eyes, explains About.com. High stress situations and orgasms can cause an aneurysm. Very small aneurysms don't cause bleeding.

A bleeding aneurysm can be very dangerous if not fatal, according to the University of Pittsburgh Medical Center. The doctor must perform a CT scan to see if there is any bleeding. Depending on the results, a procedure called clip ligation surgery may be required to control and decrease the risk of bleeding. However, a less invasive operation, aneurysm coiling surgery, may be sufficient to correct the problem.

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