Rising fear about concussions sustained while playing contact sports has sparked a national debate among doctors over the safety of youth sports.
The Centers for Disease Control and Prevention estimates that about 173,000 children are treated for concussions from sports-related activities nationwide each year.
It's unclear what the long-term effects of concussions are for young athletes, but there's fresh alarm swirling around the damage to professional athletes' brains. However, some experts question whether the extent of the damage seen in adults is comparable to what young athletes might experience.
Front and center in the debate: chronic traumatic encephalopathy, or CTE. The progressive degenerative brain disease can be confirmed only after a person dies.
Studies of brains donated by the families of NFL players who suffered multiple concussions throughout their careers found CTE in 87 of the 91 deceased NFL players.
The forensic pathologist who discovered the suspected link between head trauma and CTE in NFL players is the subject of a new movie, "Concussion."
But some doctors caution against getting overly alarmed about concussion risks that come with playing any contact sport.
"The vast majority of people who have a single concussion or even two or three will recover completely," said Dr. Uzma Samadani, a neurosurgeon at Hennepin County Medical Center and author of a new book, "The Football Decision: An Exploration Into Every Parent's Dilemma on Whether or Not to Let a Child Play Contact Sports." She added that there is no "causative evidence" that a single concussion can lead to CTE.