The brain injury association Headway classifies brain injuries as traumatic or acquired: A traumatic brain injury is caused by a blow to the head. There are many possible causes, such as a car crash, sporting accident or a fall from height. Injuries may range from a mild concussion to damage that is more wide-ranging and long-lasting, depending on the location, type and severity of the injury. An acquired brain injury is one that has been there since birth. You may have a claim for compensation if the acquired brain injury was caused by a birth or pregnancy mistake.