An aortic aneurysm occurs when a weakened artery bulges out in the wall of the aorta. This is often caused by atherosclerosis, or hardening of the arteries, or high blood pressure. Treatment depends on several factors including age, gender, and aneurysm size. For smaller aneurysms, medications and lifestyle changes may help. Sometimes, surgery is recommended. Follow the links below to find WebMD's comprehensive coverage about how an aortic aneurysm is contracted, what it looks like, how to treat it, and much more.