Mild Brain Injury Symptoms
The most common type of mild head injury is concussion. It happens when the brain receives trauma from an impact or a sudden movement change.
symptoms
Severe Brain Injury Symptoms
According to the Brain injury Association of America, severe brain injury may cause the person to experience deep sleep where one cannot be aroused nor can he respond purposefully. He has no sleep or wake cycles resulting in a coma or longer period of unconsciousness.