Question: how does abdominal aortic aneurysm happen?
Answer: Abdominal aortic aneurysm. An abdominal aortic aneurysm occurs when a lower portion of your body's main artery (aorta) becomes weakened and bulges. An abdominal aortic aneurysm is an enlarged area in the lower part of the major vessel that supplies blood to the body (aorta).