Patients with acute SDH generally will present unconscious after a severe trauma
Patients with chronic SDH generally present with altered mental status or vague complaints
High index of suspicion warranted in the aforementioned groups of patients at increased risk with any history of head trauma regardless of severity
Subdural hemorrhage
Intra-axial
Subdural empyema
Hemorrhagic stroke 
Subarachnoid hemorrhage
Traumatic intracerebral hemorrhage
Epidural hemorrhage
Extra-axial