Accurate diagnosis and appropriate management of subarachnoid hemorrhage (SAH) often presents a challenge for neurologists. The author of this volume, who is both a neurologist and a surgeon, clarifies the steps a neurologist should take when a patient is at risk of SAH, explains when surgery is advised, and helps physicians to treat patients after SAH. All of the causes of SAH, including intracranial aneurysms, are considered to provide a useful guide to case management. Historical, epidemiological, and economic/medico-legal aspects are discussed initially, followed by discussions of diagnosis, pathology, physiology, and medical, surgical, and radiological therapies.