According to the Centers for Disease Control, in the United States, over 35% of TBI’s are caused by falls. Behind that, 17% are caused by motor vehicle accidents and 27% are caused by miscellaneous blows or “strikes” to the head. Unknown causes account for 21% of TBI. Assaults (one person striking another) account for 10% of TBI cases each year. A traumatic brain injury can be caused by any jolt, sudden start-stop movement, or blunt force trauma to the head. Slip and fall accidents, in which the victim falls and hits the head on a hard surface, are the most common cause.