An aortic aneurysm is a bulge in a section of the body's main artery known as the aorta. The aorta carries oxygen-rich blood from the heart to the rest of the body. Because the section with the aneurysm is overstretched and weak, it can burst. If the aorta bursts, it can cause serious bleeding that can quickly lead to death. Aneurysms can form in any section of the aorta, but they are most common in the abdominal area. Click here to learn more about what causes an AAA, the symptoms, risk factors, diagnosis and treatment options.