How long does subarachnoid hemorrhage last?

Subarachnoid hemorrhage can be divided into traumatic subarachnoid hemorrhage and spontaneous subarachnoid hemorrhage. Traumatic subarachnoid hemorrhage usually takes about a week to pass through the critical period. Spontaneous subarachnoid hemorrhage is usually related to ruptured cerebral aneurysms and belongs to the critical period before treating cerebral aneurysms.