In this clip UFC Legend Matt Serra and Director Gavin O'Connor talk about getting concussions from football and fights.

The two-hour "League of Denial" episode of "Frontline" will not be comfortable for NFL fans to watch. However, it's important if you care about the concussion issue and how it's affecting the sport.

Concussions have become a hot-button topic in the NFL world over the last decade-plus, with hits to the head—and both their short- and long-term effects—having been proven to have a significant impact ...

Concussions are one of the most common injuries in high school football, with an estimated 100,000 to 150,000 cases each year—yet nearly half go unreported, increasing the risk of long-term brain ...

Concussions and repetitive brain injuries are relatively new topics in the public realm, primarily brought to light after a series of high-profile cases in the media connected to professional football ...