Although what causes this weakness is unclear, smoking and high blood pressure are thought to increase the risk of an aneurysm. The bulging occurs when the wall of the aorta weakens. In most cases, an Abdominal Aortic Aneurysm (AAA) causes no noticeable symptoms. However, if it becomes large, some people may develop a pain or a pulsating feeling in their abdomen or persistent back pain.
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