High school athlete Graham Hill, number 50, suffered a concussion in 2013 while playing football at Trinity Christian Academy in Addison, Texas. Courtesy of Jeffrey McWhorter hide caption

itoggle caption Courtesy of Jeffrey McWhorter

The Coachella Valley High School mascot gives the thumbs up at a 2010 football game. Image courtesy of MyDesert.com. Jay Calderon/Courtesy of The Desert Sun hide caption

itoggle caption Jay Calderon/Courtesy of The Desert Sun