Abdominal aortic aneurysms often grow slowly without noticeable symptoms, making them difficult to detect. Some aneurysms never rupture. Many start small and stay small. Others grow larger over time, sometimes quickly. If you have an enlarging abdominal aortic aneurysm, you might notice: 
Deep, constant pain in the belly area or side of the belly (abdomen)
Back pain
A pulse near the bellybutton
