Is subarachnoid hemorrhage always a very serious problem?

Yes: It can be, so we never take a chance and look for aneurism by doing an angiogram on everybody with subarachnoid. Bleed. The most common cause is actually head trauma, which has a better prognosis and requires less aggressive workup..

Yes: Aneurysm arteriovenous malformations trauma tumors all are serious and most can be treated.

Critical: A subarachnoid hemorrhage from either a rupture of an aneurysm or arteriovenous malformation is a medical emergency and requires intensive care and maybe surgery. The death rate within the first year can be 60%, and not unique to get a permanent stroke and communicating hydrocephalus from the bleeding. Outcomes can be good, but need skilled practitioners.