During a scary moment Saturday night in Oxford, Arkansas defensive back Kani Walker had to be carted off the field after suffering an apparent head injury against Ole Miss. Walker went down to the turf after a teammate's knee hit him in the back of his head.

Ahead of the ninth inning, Arraez was struck in the head on a warm-up throw meant for first baseman Ryan O'Hearn as he jogged onto the infield at Petco Park. Padres manager Mike Shildt said that Arraez was being evaluated for a head injury, but that the seven-year veteran was responsive.

Ryan Kelly, who signed with the Vikings in the offseason, left the game in the first half of Sunday night's game.

After the 49ers' 26-21 win over the Saints, San Francisco head coach Kyle Shanahan shared injury updates from the game.

Kason Heniser, a 9-year-old boy, was taken to a hospital with serious head injuries after he was slammed to the ground by another fourth grader during an altercation at an elementary school in Huntsville,

KaVontae Turpin delivered encouraging news on his Week 2 neck injury; Cooper Beebe's ankle, however, could be more problematic.

As awareness grows around the dangers of head trauma in sports, a small number of professional fighters and football players are turning to a psychedelic called ibogaine for treatment.