What is a subarachnoid hemorrhage?
Subarachnoid hemorrhage is considered a stroke only when it occurs spontaneously, meaning there is no accident or fall. A spontaneous hemorrhage usually results from the sudden rupture of an aneurysm in a brain artery, according to a scientific paper by Andrei V. Alexandrov, MD, and Balaji Krishnaiah , MD, of The University of Tennessee Health Science Center.