With some traumatic brain injuries, it's very obvious that people have been injured. They lose consciousness, they have trouble speaking, and they show other clear physical signs. However, it's important to remember that not all TBIs look the same, and some may not come with the normal set of signs.
Take, for example, the case of a young girl who was riding on a school bus. Another bus was driving behind the first one, and it rear-ended the girl's bus. The impact knocked her forward and her head hit the seat she was facing.