Distinguishing Characteristics of Headache in Nontraumatic Subarachnoid Hemorrhage.

This is the first study that has sought to examine in detail the clinical characteristics of the presenting headache in SAH. Our study suggests that the clinical features of headache with SAH are distinct from those associated with other headache syndromes, and that this may prove useful in the acute care setting in triaging patients with a chief complaint of headache.