Traumatic Brain Injury and Depression
Background: Traumatic Brain Injury
TBI occurs when an external force—from events such as falls, assaults, motor vehicle accidents, or blasts—injures the brain. It may occur as a result of a direct hit to the head. Rapidly accelerating and decelerating wind, accompanied by pressure changes, may also cause direct injury to the brain or propel other objects into the head (as from a blast). Internal impact of the brain against the skull due to a direct impact to the head or rapid acceleration/deceleration of brain tissue may result in tissue damage, swelling, inflammation, and internal bleeding. Outside of the military theater, TBIs are most commonly associated with falls (28%), motor vehicle-traffic crashes (20%), being struck by objects (19%), and assault (11%).
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