What is a traumatic brain injury, or “TBI”?

A traumatic brain injury, also referred to by some as an acquired brain injury, is an injury to the brain that is caused by a bump, blow, or jolt to the head or a penetrating head injury that disrupts the normal function of the brain.  Not all jolts or bumps to the head result in a TBI.  The severity of a TBI may range from “mild” to “severe.”  The majority of TBIs that occur every year in the U.S. are concussions or other forms of mild TBI.