Subdural hematoma (SDH) refers to bleeding into the intracranial subdural space that is typically caused by a rupture of the bridging veins. Trauma, including minor falls, cerebral atrophy, and conditions that increase the risk of bleeding (e.g., coagulopathy, hypertension) are common etiologies of SDH. According to the onset of symptoms, SDH can be classified into acute SDH, subacute SDH, and chronic SDH. Acutely symptomatic SDH typically manifests with altered mental status, focal neurological signs, and signs of increased ICP, and it can progress to brain herniation and death if not treated. Chronic SDH manifests gradually with cognitive deficits, impaired memory, personality changes, and focal neurological signs. Subacute SDH can manifest with features of acute and/or chronic SDH. In patients with acutely symptomatic SDH, neuroprotective measures to prevent secondary brain injury take precedence over diagnostics. Diagnosis is confirmed with a noncontrast head CT, which would show a crescent-shaped (concave) lesion that may cross cranial sutures typically located in the supratentorial region. Surgery is recommended in SDH that is symptomatic, ≥ 10 mm in size, or causing ≥ 5 mm shift in the midline. Conservative management can be considered for small asymptomatic SDHs in patients with no signs of increased ICP.