Sudden, severe headache that reaches maximal intensity within minutes (97% of cases)
Sudden onset is more important finding than worst headache
May be associated with syncope, seizure, nausea/vomiting, meningismus
Meningismus may not develop until hrs after bleed (blood breakdown → aseptic meningitis)
Retinal hemorrhage
May be the only clue in comatose patients
Sentinel bleed headache 6-20 days before serious<unk>  in 30-50% of patients
Sudden onset is more important finding than worst headache
Meningismus may not develop until hrs after bleed (blood breakdown → aseptic meningitis)
May be the only clue in comatose patients
Subarachnoid hemorrhage
Intra-axial
Subdural hemorrhage
Hemorrhagic stroke 
Ischemic stroke
Traumatic intracerebral hemorrhage
Hemorrhagic stroke
Extra-axial