What history findings suggest chronic subdural hematoma (SDH)?

Updated: Jul 26, 2018
  • Author: Richard J Meagher, MD; Chief Editor: Helmi L Lutsep, MD  more...
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One quarter to one half of patients with chronic subdural hematoma have no identifiable history of head trauma. If a patient does have a history of head trauma, it is usually mild.

Of patients who have sustained head injury, symptoms develop after 1-4 weeks in 25%. Another 25% experience symptoms from 5 weeks to 3 months before their hospital admission. Only one third of patients have no asymptomatic period.

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