Brain injury refers to the death of brain cells and disruption of neural pathways, which results in changes in the way a person thinks, feels, and acts. There are 10 million Americans are living with brain injury including stroke. Every 21 seconds, a person sustains Traumatic Brain Injury (TBI) in this country, resulting in 1.4 million new TBIs each year.

Acquired brain injury (ABI) is an injury to the brain secondary to either trauma, stroke (including aneurysms), post surgical complications, and/or certain acquired disease processes. The most common causes of non-traumatic ABI are tumor, stroke, aneurysm, near drowning, infections of the brain, and ingestion of toxic substances

TBI is an insult to the brain caused by a direct blow to the head or the head hitting an object or being shaken violently. TBI is the leading cause of disability and death among children and adolescents, with over 1 million children sustaining brain injuries each year.
Nationwide each year, 30,000 children end up with severe disability as the result of brain injury. The most common causes of TBI are falls, motor vehicle crashes, bicycle accidents, sports and recreation injuries, shaken baby syndrome, gunshot wounds and assaults.

Brain injury is a disorder of major public health significance. Mild TBI is often under-diagnosed or mis-diagnosed, with symptoms not always immediately apparent. Loss of consciousness does not have to occur - a person may simply appear dazed or confused.
Concussion is a mild TBI, and is defined as a trauma-induced alteration in mental status