An aneurysm is a rounded pouch on one of the blood vessels at the bottom of the brain. If it reaches a critical size and form, it can burst open with the entire force of the body’s blood pressure. Blood then fills the spaces around the brain in a split second and causes a thunderbolt of a headache that no one forgets and many don’t survive. One-third of patients who do survive have a re-rupture in days, and half of those people die.
