At least one in four former NFL players who died between 2016 and 2021 had chronic traumatic encephalopathy (CTE) [1].
The findings highlight the long-term neurological risks associated with professional football. Because CTE is a degenerative brain disease that can only be diagnosed after death, these figures provide a critical window into the prevalence of brain trauma among retired athletes.
The study, published in the BMJ journal, examined the brains of former players over a five-year span from 2016 to 2021 [2]. Researchers found that approximately 25% of the subjects showed signs of the disease [1]. The research was led by a team including Dr. Chris Nowinski of the Concussion and CTE Foundation.
CTE is linked to repeated head impacts sustained during years of professional play. These impacts can cause the accumulation of tau protein in the brain, leading to cognitive impairment, mood swings, and memory loss. While the NFL has implemented various rule changes to reduce concussions, the study suggests that the cumulative effect of sub-concussive hits remains a significant factor.
The data suggests that the risk of developing the disease is widespread across the league's alumni. By focusing on a specific window of deaths, researchers aimed to create a more accurate estimate of how common the condition is among those who played in the U.S. professional league [1].
This research adds to a growing body of evidence regarding the dangers of contact sports. The prevalence rate of 25% indicates that a substantial portion of the player population may suffer from brain degeneration, regardless of whether they experienced a diagnosed concussion during their active career [1].
“At least one in four former NFL players who died between 2016 and 2021 had CTE”
This study provides quantitative evidence that brain trauma is a systemic issue rather than an isolated occurrence among NFL players. By establishing a prevalence rate of 25% for a specific cohort, the research pressures sports organizations to move beyond concussion protocols and address the cumulative impact of repeated sub-concussive hits that occur during standard gameplay.
