trau•mat•ic brain in•ju•ry | truh–mat-ik breyn in-juh-ree
Traumatic brain injury — or TBI — is a form of acquired brain injury resulting from sudden trauma that damages the brain. TBI can occur when there is a sudden blow or jolt to the head, or when there is a penetrating injury to the skull.
A TBI can be classified as either mild, moderate, or severe. People with brain injuries are susceptible to a variety of impairments as a result of the injury, depending on the severity.