A traumatic brain injury or TBI is generally caused by an external force impacting the brain that damages the tissues of the brain. Some examples of that type of injury are car crash or truck crash or slip and fall where the heads hit something solid. These type of injuries can be subtle. You might not think that a brain injury is the result of something that doesn’t cause the cracked skull. It’s entirely possible that somebody has a TBI or brain injury without even losing consciousness.