Some risk factors of brain aneurysms may be present when an individual is born, while others develop with age. Factors present at birth include a family history of brain aneurysms, polycystic kidney disease, inherited connective tissue disorders, an abnormally narrow aorta, and cerebral arteriovenous malformation. Later in life, the risk of an aneurysm can increase due to alcohol, drug, and cigarette consumption, smoking cigarettes, high blood pressure, and old age, in general.

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