Subdural Hematoma

Subdural Hematoma

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A subdural hematoma is a collection of blood outside the brain. Blood collects between the layers of the tissue that surround the brain. The bleeding of a subdural hematoma is not in the brain itself. However, as blood accumulates the pressure on the brain increases. This pressure causes the symptoms of this condition and if the pressure on the brain rises to a high level it can cause unconsciousness, even death.


Subdural hematomas are usually caused by a serious head injury such as a fall, a motor vehicle accident or possibly an assault or sporting accident. This is considered an "acute" subdural hematoma. People who are on blood thinners are more likely to get a subdural hematoma from even a slight injury. In "chronic" subdural hematomas, the small veins on the outer surface of the brain tear and cause bleeding in the subdural space. Symptoms of this type may not appear for days or weeks.


Symptoms of a subdural hematoma may be sudden or gradual depending on the circumstance and cause. Sudden subdural hematomas from injury may cause a person to lose consciousness or go into a coma immediately. In the event of an injury where there are no immediate symptoms a person may appear normal for several days after slowly becoming confused and possibly unconscious several days later. This may cause the subdural hematoma to slowly grow causing pressure on the brain. Even in a slight injury with a slow growing hematoma, there may not be any symptoms for weeks after the injury. Symptoms may include:

  • Headache
  • Dizziness
  • Confusion
  • Nausea and/or vomiting
  • Drowsiness or lethargy
  • Weakness
  • Seizures


Individuals who present to and emergency room or seek medical attention after a head injury will undergo scans such as CT scans or MRI scans to detect the presence of a subdural hematoma.

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