What's a traumatic brain injury?

Brain damage: Tbi- traumatic brain injury is when the brain is injured from a strike, fall, accident, explosion or any other concussive injury to the head injuring the underlying soft brain tissue. They can be mild from concussion to severe such as persistent vegetative state.

Varying definitions: As others note this reflects an injury to the brain which can be very mild and usually with transitory effects to very severe with permanent and life-changing effects. See http://cpancf.Com/headinjuryclassification.Asp.

Damage from trauma: A traumatic brain injury is brain damage due to trauma to the head and brain, as opposed to infection, spontaneous hemorrhage from an aneurysm, damage due to inadequate breathing, low blood sugar or other metabolic abnormalities.