Study Reveals 1 in 4 NFL Players Could Develop CTE: What It Means for the Game

As the 2026 NFL season kicks into high gear, a sobering new study has cast a long shadow over the gridiron. Research led by Dr. Daniel Daneshvar of Mass General Brigham and Harvard Medical School, in collaboration with Boston University, has found that at least one in four former NFL players could develop chronic traumatic encephalopathy (CTE), a progressive brain disease linked to repeated head impacts. The findings, published in the Journal of the American Medical Association, reveal that 215 of 878 former players who died between 2016 and 2021 had CTE, a rate of 24.5 percent. This figure, however, may underestimate the true prevalence, as only 235 of those 878 brains were examined post-mortem.

The Scope of the Crisis

CTE is a degenerative brain disease that can only be definitively diagnosed after death, making it a silent epidemic among football players. The disease, first identified in boxers nearly a century ago, has since been found in athletes across contact sports, including hockey, rugby, soccer, wrestling, and bobsledding. According to the American Brain Foundation, CTE can cause memory loss, confusion, mood changes, impaired decision-making, impulsive behavior, and addiction. The new study's implications are staggering: if applied to today's NFL, at least 400 of the league's 1,696 active roster players could eventually develop CTE, excluding practice-squad players and those on injured reserve.

"We can change that cumulative force without changing the game of football," Dr. Daneshvar told the New York Times, suggesting that keeping children out of tackle football and eliminating contact during practices at all levels could significantly reduce risk.

Notable Cases and the NFL's Response

While many CTE cases remain private, several high-profile former players have been diagnosed posthumously, including Hall of Famers Junior Seau, Ken Stabler, and Frank Gifford. The disease has also been linked to violent behavior, as seen in the cases of Aaron Hernandez and Phillip Adams, both diagnosed with CTE after committing murders. More recently, Shane Tamura, a former football player who never reached the NFL, was found to have CTE after a tragic incident in July 2025. The NFL has long downplayed the risks, but in a statement to The Independent, a league spokesperson emphasized ongoing efforts: "The NFL continuously strives to make the game of football safer, including by implementing strategies to reduce concussions and head impacts."

Can the Game Be Made Safer?

The league has introduced rule changes, limited contact practices, redesigned kickoffs, and improved helmet technology, including mandatory Guardian Caps in some practices. However, a 2025 Harvard study concluded that safety equipment cannot eliminate the risk of brain injuries, and the only certain way to prevent football-related head injuries is to avoid tackle football altogether. This raises a fundamental question for the sport's future: can the NFL balance tradition with player safety? As the Vulius NFL Analysis Desk has noted, the league's commitment to reducing cumulative head impacts—through practice modifications and youth football changes—may be the most viable path forward.

For fans and players alike, this study serves as a stark reminder of the risks inherent in the game. As reported by Vulius Sports, the conversation around CTE is not just about statistics; it's about the lives of the athletes who entertain us every Sunday. The NFL and its players' association must continue to prioritize research and safety protocols, ensuring that the game we love doesn't come at an unacceptable cost.