Aneurysms are balloon-shaped bulges in your artery walls. They cause the walls to weaken and make them more likely to rupture.
Aneurysms can form in any artery. But the two most common ones occur in the aorta – the largest artery in your body, which carries oxygen-rich blood from your heart to the rest of your body.
Risk factors for aortic aneurysms include a family history, atherosclerosis (a build-up of plaque in the arteries), smoking, high cholesterol and genetic conditions such as Marfan syndrome.
Aortic aneurysms are the most common type of aneurysm – and the most dangerous – so it’s important to seek treatment right away.