Subarachnoid hemorrhage due to rupture of a cerebral aneurysm is most common in persons age 20 to 60. It is slightly more common in women than men.A further 10% of cases is due to non-aneurysmal perimesencephalic hemorrhage, in which the blood is limited to the area of the midbrain.  Nitroxin  Risk factors for subarachnoid hemorrhage are smoking, hypertension and extreme alcohol intake; all are associated with a doubled risk for SAH. The…