Traumatic brain injuries do not heal like other injuries. Recovery is a functional recovery, based on mechanisms that remain uncertain. No two brain injuries are alike and the consequence of two similar injuries may be very different. Symptoms may appear right away or may not be present for days or weeks following the injury.
Studies suggest that once brain cells are destroyed or damaged, for the most part, they do not regenerate. However, in some cases, recovery after brain injury can take place as other areas of the brain compensate for the injured tissue, or the brain learns to reroute information and function around the damaged areas. The exact amount of recovery is not predictable at the time of injury and may not be known for months or even years. Each brain injury and rate of recovery is unique. Recovery from a severe traumatic brain injury often involves a prolonged or life-long process of treatment and rehabilitation.