I’m Ed Smith, a Fresno car accident lawyer. Though concussions may not seem to be very serious, they are the most common type of brain injury and can have serious consequences. Traumatic brain injuries can sometimes be deadly. Some of the most common causes of concussions happen through sports or recreational activities. Other people sustain brain injuries in car accidents, slips or falls, or workplace accidents. The frightening aspect of a brain injury is that the sufferer may not realize they are ill until other symptoms present themseleves.