Can a significant head injury or a minor concussion cause ADHD?

Behavior problems from significant traumatic brain injury include irritability, fatigue, impulsiveness, decreased anger control, disinhibition, decreased motivation, decreased frustration tolerance, decreased initiative, aggressiveness, decreased attention, and hypo- or hyperactivity. This is due at least in part to the fact that a closed-head injury is likely to damage the frontal lobes of the brain. A physician must carefully and indefinitely monitor the classroom attention of a child who has sustained a significant head injury. In contrast, concussions, which are associated with only a brief loss of consciousness, are considered very minor head injuries. Nonetheless, children may have trouble concentrating and focusing for several weeks after a concussion. The effects are transient, but can temporarily affect school performance. Paying attention to the problem will minimize it.