Study: CTE Found in 215 of 235 Donated Brains From Former NFL Players

A new study has found that at least one in four former NFL players who died between 2016 and 2021 suffered from chronic traumatic encephalopathy, the degenerative brain disease tied to repeated head trauma. Researchers from Mass General Brigham, Boston University and the Concussion and CTE Foundation examined the brains of 235 former players out of 878 who died in that period and identified the condition in 215 cases.

The findings underscore the long-term risks faced by athletes in a sport where collisions remain central to play. CTE can only be confirmed after death and is linked to symptoms including memory loss, mood disorders, dementia and headaches. Lead author Daniel Daneshvar noted that NFL players experience roughly four times the rate of death from neurodegenerative diseases compared with the general population. The study also recorded high rates of dementia among the brain donors and called for stronger prevention efforts focused on limiting repetitive head impacts at every level of football, from youth leagues upward.

The NFL issued a standard response emphasizing ongoing efforts to reduce concussions and head impacts while pointing to expanded resources for players physical and mental health. The league urged former players to seek treatment when concerned. Yet such statements have come amid years of mounting evidence about the sport's neurological toll, raising questions about whether corporate commitments have kept pace with the documented harms.

Many of the head impacts that contributed to these cases occurred well before players reached the professional level, according to the researchers. This points to systemic issues across the sport's pipeline, where young athletes absorb thousands of subconcussive blows during practices and games with limited oversight or rule changes. The concentration of risk among those who advance to the NFL highlights how the league benefits from a development system that may expose participants to cumulative damage long before they sign professional contracts.

Critics have long argued that the NFL's emphasis on player safety measures often serves public relations more than fundamental reform. Rule tweaks and equipment adjustments have been introduced, but the core structure of the game continues to reward physical dominance. The study's donor pool, while self-selected, represents a significant sample and aligns with prior research showing elevated neurodegenerative risks in contact sports. With dementia appearing frequently among the examined brains, the data suggest that current resources for former players may fall short of addressing the scale of need.

Families and advocates have pushed for greater accountability, including better compensation structures and independent medical oversight. The NFL's multibillion-dollar revenues stand in contrast to the personal costs borne by players and their loved ones. As the study makes clear, the bulk of exposure happens outside the professional ranks, meaning meaningful change would require coordinated action from youth organizations, high schools, colleges and the league itself.

Daneshvar and colleagues stressed that repeated traumatic brain injuries drive higher rates of these diseases. Their findings arrive at a moment when public awareness of CTE has grown, yet participation in football remains widespread. The challenge now lies in translating scientific evidence into policies that genuinely prioritize long-term brain health over short-term spectacle. Without deeper structural shifts, the pattern of neurodegenerative disease among former players is likely to persist.