What is traumatic brain injury?

    Last Updated: October 25, 2023

    Traumatic brain injury (TBI) is a disruption in the normal function of the brain that can be caused by physical trauma. TBIs are classified as either “closed”, meaning the skull remains intact, or “open”, meaning the skull has been fractured.[1]. TBIs are further classified as mild, moderate, or severe. Mild TBI is often referred to as concussion. Severe brain injury can cause coma, permanent disability, or death.[2]