Major League Baseball isn't usually considered a contact sport, but collisions can and do happen. Our Katie Gibas has more.
"As we've seen, pitchers have gotten hit in the head. And I find that to be, as a former player, my biggest fear, as a father of a son who plays on the big league level, that's probably my biggest fear is the line drive back up the middle. Short of putting catching gear on a pitcher, to totally protect them, it's just one of those things. It's a risk of the game," said Steve Grilli, Former MLB Player, Telecommentator for Chief's TV Game.
And line drivers aren't the only concussion concern.
Base runners colliding with infielders, particularly the catcher, is a problem.
And players running into walls or jumping into the stands to catch a fly ball are also at risk that was often the case for former MLB player Ryan Freel.
Freel committed suicide last December and after study, researchers say he had Chronic Traumatic Encephalopathy or CTE.
Freel played for the Syracuse Chiefs in the late 90s and 2000s.
He played for several Major League teams in his career.
He's the first MLB player to be diagnosed with CTE.
"It's a dementia, a condition that affects the brain. There's a deterioration and deposit of different chemicals in the brain that can cause psychiatric problems. It can cause cognitive and mood problems and can be quite disabling," said Brian Rieger, PhD, Upstate Concussion Center Director.
Experts say rule changes can only go so far in terms of protecting players. They say more education is needed and better treatment after the injury.
"We're never going to eliminate concussions or head injuries from sports. At some point, we have to accept some risk, but we have to make sure that we educate people about those risks and about what to do when the injury occurs," Rieger added.
In the winter meetings this year, MLB went so far as to ban home plate collisions, so as to protect catchers from a variety of injuries, including concussions.