In this overview, the present day knowledge on the epidemiology of abdominal aortic aneurysms (AAA) is summarized based on a review of the current literature. The prevalence of AAA and incidence of rupture is analyzed, and the natural history of the disease is illustrated both concerning the AAA as such and the survival of the patient. This knowledge is important when contemplating on screening for AAA, which is being implemented in several countries worldwide.