Traumatic brain injuries (TBI) are always impact related. When severe injury occurs in the brain due to any forceful impact on the head it is called TBI. Sports activities accidents and violent aggression can cause this kind of injury. There are three kinds of traumatic brain injuries. If you get hit in the head and suffer an injury it is called a closed head injury. An open head injury is one where an object penetrates the skull. At times shaking the head violently can cause injury. This is very common in babies. In this there is usually damage to nerve