Mild traumatic brain injury. Introduction.
MTBI may be caused by diffuse (affecting the whole brain) or focal (affecting a specific area) injury. In diffuse injuries, a blow to the head leading to temporary loss of consciousness can result in stretching and tearing of nerve fibres throughout the brain. Most stretched nerve cells will return to normal, but some may be permanently damaged, either functioning abnormally or not functioning at all. This causes the symptoms of MTBI.