The leading cause of baseball deaths. Commotio cordis isn&#39;t really an injury; it&#39;s bad luck. Commotio cordis comes from getting hit in the chest with a baseball and dropping dead from sudden cardiac arrest. If you&#39;re a baseball coach or a baseball parent, this is why you need to learn CPR.Sliding into second base and gopher holes in the outfield lead to twisted ankles. Throwing can be hard on arms as well.One of the worst ankle fractures I ever treated came from an adult male softball player sliding into second base (fast pitch softball). His ankle was dislocated and shattered; it was brutal.Batters wear helmets, but nobody else does. Over the last few years we&#39;ve learned just how dangerous a knock to the noggin can be. Besides an errant pitch, players can also smack each other with bats or run into one another trying to catch a fly ball.It&#39;s almost a rite of passage to get a black eye or a nosebleed from a baseball in little league. It&#39;s much less accepted to lose a tooth or split a lip. See #4 to understand why it&#39;s a bad idea to take one on the noggin anywhere, face included.