An abdominal aortic aneurysm (AAA) is a widening of the main artery that carries blood from the heart to the lower body. Small aneurysms often develop without noticeable symptoms, while larger ones may require careful monitoring to reduce the risk of complications. This page explains common causes, warning signs, risk factors, diagnostic imaging, treatment approaches, follow-up care, and preventive measures to help readers better understand abdominal aortic aneurysms. Learn more from Rivea Vascular Institute.