A brain aneurysm, is a bulge in one or more of the arteries in the brain and can be occur at any age.

Many times a brain aneurysm is discovered when they rupture, causing bleeding into the brain. Brain aneurysms can be due to high blood pressure and atherosclerosis. Other causes can be blood infections, low estrogen levels, alcoholism, and head injury.

Once an aneurysm has ruptured, the main goal of treatment is to stop the bleeding and to reduce the risk of recurrence.