Hemorrhage - subarachnoid Subarachnoid hemorrhage is bleeding in
the area between the brain and the thin tissues that cover the
brain. This area is called the subarachnoid space. Subarachnoid
hemorrhage can be caused by: Injury-related subarachnoid
hemorrhage is often seen in the elderly who have fallen and hit
their head. Among the young, the most common injury leading to
subarachnoid hemorrhage is motor vehicle crashes. Subarachnoid
hemorrhage caused by a cerebral aneurysm that breaks open
(ruptures) occurs in about 40 - 50 out of 100,000 people over
age 30. Subarachnoid hemorrhage due to rupture of a cerebral
aneurysm is most common in persons ages 20 to 60. It is slightly
more common in women than men. A strong family history of
aneurysms may also increase your risk. Selman WR, Hsu D, Tarr
RW, Ratcheson RA. Vascular diseases of the nervous system:
intracranial aneurysms and subarachnoid hemorrhage. In: Bradley
WG, Daroff RB, Fenichel GM, Jankovic J, eds. Neurology in
Clinical Practice. 5th ed. Philadelphi