A traumatic brain injury may occur when the head or body is hit violently from an outside force. For example, this may occur in a car accident or as a result of falling down the stairs. A few of the many potential symptoms of a traumatic brain injury include loss of consciousness, confusion, headache, dizziness, nausea or vomiting, changes in mood, pupil dilation, light or sound sensitivity, and seizures. Varying degrees of damage may result from a TBI. Minor injuries may heal in a short amount of time. But a severe TBI may permanently affect the brain or result in death.