Version August 2025
| History |
| Explosive onset and severe at onset |
| No similar headaches in the past |
| Concomitant infection |
| Altered mental status or seizure |
| Associated with exertion (eg, exercise, sexual intercourse) |
| Age over 50 years |
| Immunosuppression (eg, HIV, chronic glucocorticoid therapy) |
| Visual disturbances |
| Pregnancy or postpartum state |
| Medications or illicit drugs (eg, anticoagulants, sympathomimetic agents) |
| Physical examination |
| Abnormal vital signs |
| Neurologic abnormalities |
| Decreased level of consciousness |
| Meningismus |
| Toxic appearance |
| Papilledema or other ophthalmologic findings |
