Although brain injuries are one of the most serious health hazards facing the nation today, the health issues related to head injuries are largely ignored and widely misunderstood. Even with modern diagnostic equipment, doctors have difficulty assessing exactly which components of the brain have been injured and to what extent. There is no way to know how quickly or how completely a person can recover from a brain injury. Unlike other types of injuries or illnesses, a traumatic brain injury can change how you act, how you react to situations, and your ability to think, joke, cry, and love. Dealing with these emotional issues is often the most challenging part of the rehabilitative process.