Conor McGregor has reportedly retired from the sport of mixed martial arts, and the last handful of hours have been a whirlwind. Dana White has appeared on ESPN already to say that the featherweight champion will no longer be participating at UFC 200 this July, which is a huge loss to everyone on that card and the promotion itself.

However, this is a very real problem for the UFC and the scope reaches well beyond just Conor McGregor and the unfortunate incident surrounding Joao Carvalho, who died last week after sustaining head injuries in a TKO loss.

We’ve all been following how Ronda Rousey’s steadily and carefully tracked her recovery after getting blasted in the skull by Holly Holm at UFC 193. Nobody should be talking shit about that anymore.

Concussions are a big issue in sport, but death from a head injury is a fear that’s all too real for contact athletes in sports like MMA, hockey and football. We don’t know anything about the long-term impacts of concussions just yet, and McGregor is not the first athlete to walk away from money, fame and glory in order to preserve his health. He won’t be the last either.