What causes traumatic brain injury?

Most brain injuries are caused by trauma. That can include a blow to the head, where the force travels through the skull and damages the soft brain tissue, or it can include a force that causes the head to move quickly so that the brain moves inside the skull and hits the skull.

Approximately 50 to 70 percent of all traumatic brain injuries are caused by car crashes. Another common cause of brain injuries is a loss of oxygen to the brain.