A concussion is a brain injury. A concussion, also known as a traumatic brain injury , causes a change in mental status at the time of injury such as feeling dazed, disoriented or confused, which may or may not involve a loss of consciousness. It can result from a fall, a blow or jolt to the head or body, the shaking or spinning of the body, or the acceleration and deceleration of the head (like in a car collision). The Centers for Disease Control and Prevention found that and estimated 1.7 million people sustain a traumatic brain injury annually and of them: 52,000 die, 275,000 are hospitalized, and 1.365 million are treated and released from an emergency department. Those who have had a concussion in the past are at a greater risk of having one in the future and may find that it takes longer to recover if they have another concussion. Also a person who sustains a repeat concussion before recovering from the first, may have an increased likelihood of long-term consequences such as permanent brain damage or death. The functional effects of a concussion are wide-ranging and can affect thinking and learning, as well as social and emotional functioning. A person who suspects he or she has sustained a concussion should seek medical attention immediately. The failure to do so can lead to disaster.