Link:CDC Features - Concussion.this article has important information about children's health please follow the link

A concussion is a brain injury caused by a bump or blow to the head that can change the way your brain normally works. Even what seems to be a mild bump or blow to the head can be serious. As many as 3.8 million sports- and recreation-related concussions are estimated to occur in the United States each year.

To help ensure the health and safety of young athletes, CDC developed the Heads Up: Concussion in Youth Sports initiative to offer information about concussions—a type of traumatic brain injury—to coaches, parents, and athletes involved in youth sports. The "Heads Up" initiative provides important information on preventing, recognizing, and responding to a concussion.