Don't forget the hearing loss and tinnitus, too. Boxers and footballers tend to go deaf.

https://www.sciencedaily.com/releases/2014/07/140707134223.h...

> Leonetti recently spoke to retired players alongside EarQ at a meeting of the Chicago chapter of the NFL Players Association. When Leonetti asked how many players had experienced concussions during their career, they all raised their hands. When Leonetti asked how many have experienced hearing loss approximately 25 percent raised their hands. When he asked how many have tinnitus approximately 50 percent raised their hands.