An aneurysm refers to a weakening of an artery wall that creates a bulge, or distention, of the artery. The most significant aneurysms affect the arteries supplying the brain and the heart. An aortic aneurysm affects the body’s main artery. The rupture of an aneurysm causes internal bleeding. An aneurysm occurs when part of an artery wall weakens, allowing it to balloon out or widen abnormally.The causes of aneurysms are sometimes unknown. Some may be congenital, meaning a person is born with them. Aortic disease or an injury may also cause an aneurysm. A family history of aneurysm may increase your risk for developing an aneurysm. Other risk factors include high blood pressure, high cholesterol and smoking.

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