Acute subdural hemorrhage usually develops after severe head trauma. Injuries that result in this condition are typically forceful enough to cause a temporary loss of consciousness.
Usually, in the minutes to hours after head injury, the person recovers consciousness. Then, the person gradually loses consciousness again, this time from subdural bleeding.
Other common symptoms of an acute subdural hemorrhage include:
Weakness on one side of the body
Changes in vision or speech
Chronic subdural hemorrhages produce more subtle symptoms. These symptoms may continue for more than a month before the diagnosis is recognized.
These symptoms include:
Nausea or vomiting
Change in personality
Loss of balance or difficulty walking
Weakness, numbness or tingling in arms or legs
The symptoms caused by chronic subdural hemorrhage can mimic other common conditions. For example, they may resemble strokes and brain tumors. Occasionally, the gradual memory loss and personality changes can be mistaken for dementia.