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After a career of concussions, George Visger, a former NFL player, says he regrets his decision to play football.

Former NFL running back Leroy Hoard discusses coping with headaches, memory loss and depression and explains why he must never forget Andre Waters, Dave Duerson and Junior Seau, three former NFL players who committed suicide.

The NFL retirement board determined in 1999 that repeated blows to the head had left Mike Webster, who spent most of his 17-year career with the Pittsburgh Steelers, "totally and permanently" disabled.

For years while the NFL's top medical experts denied any link between football and long-term brain damage, the league retirement board awarded disability payments to at least three former players after concluding that football caused their brain inju

This was supposed to be a season of triumph for Patrick Larimore, a 22-year-old middle linebacker for UCLA. But in mid-August, as his senior season was about to start, Larimore decided not to play another down - ever.

From NFL veterans, like Jacob Bell, to newcomers, like Chad Diehl, some players are choosing to walk away from football over concerns about their long-term health.

Outside the Lines examines the issue of concussions amongst high school football players. Are players becoming more aware of the problem? Ryan Hockensmith and Chris Coyne discuss the issue with Bob Ley.

Former NFL receiver Al Toon and his son, Nick, talk about the game of football as Nick embarks on his rookie season with the New Orleans Saints.

Mark Messier, Kris King and Matthew Barnaby join Outside The Lines to discuss concussions in hockey

Matthew Barnaby, Barry Melrose debate the issue of concussions and headshots in the NHL

Spring Hill Kansas High School Senior Nathan Stiles collapsed on the sideline just before halftime of his last football game. He died later at the hospital. T.J. Quinn speaks with Nathan's parents, Ron and Connie, about their son