This results in a corresponding part of the body not functioning properly. Many years of constant pounding by high blood pressure causes the walls of small brain arteries to become weakened and, in some cases, to burst. The best way to prevent an intracerebral hemorrhage is to have your blood pressure checked and, if it's high, take your doctor's advise regarding treatment. In subarachnoid hemorrhage, a larger artery at the base of the brain ruptures, resulting in bleeding around the brain, into the cerebrospinal fluid. This most often results in a sudden, severe headache, neck stiffness, nausea and vomiting, and sleepiness.
Most subarachnoid hemorrhages are due to rupture of a berry aneurysm.
An aneurysm is an area of the artery wall that becomes weakened and balloons out like a nipple. The wall of the aneurysm is stretched thin and is especially prone to rupturing. We are not sure why berry aneurysms occur in some people. Some people have them from birth. Some people have them all their lives and they never burst.