An aortic aneurysm happens when when there is weakening or bulging of the wall of the aorta, the largest blood vessel of the body. This is often caused by high blood pressure or by hardening of the arteries, called atherosclerosis. Treatment depends on several things including age, gender, and the size of the aneurysm. 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.