When an NFL player dies by suicide, the conversation often circles back to one culprit: chronic traumatic encephalopathy, the degenerative brain condition caused by repeated head impacts. The connection feels airtight. Junior Seau. Dave Duerson. Aaron Hernandez. Phillip Adams. All confirmed to have CTE by autopsy. All took their own lives.
But a Harvard research team published findings in January that complicate this narrative. The Football Player Health Study, which has tracked the health and wellbeing of professional athletes since 2014, examined death records for roughly 34,000 NFL, NBA and MLB players spanning 1979 to 2019. The data reveals something unexpected: the suicide risk story in professional football is not as straightforward as brain damage alone.
The raw numbers show NFL players were 20% more likely than basketball and baseball players to die by suicide over the full 40-year period. But when researchers broke down the data by decade, a striking pattern emerged. Between 1979 and 2009, NFL players were actually about 10% less likely to take their own lives than their NBA and MLB peers. Then something shifted. From 2009 to 2019, NFL players became 260% more likely to die by suicide compared to the other sports.
The timing poses a puzzle for the CTE theory. The first NFL-related CTE diagnosis came in 2002, but undiagnosed cases almost certainly existed throughout the 20th century. Helmet technology has improved since then, suggesting that cumulative brain damage was likely more common decades ago, not less. Yet suicides among NFL players surged in the 2010s, not the decades before.
Dr Rachel Grashow, a lead author of the Harvard study, acknowledged bringing her own assumptions to the research. "The public narrative around CTE didn't actually reflect the scientific nuance and the lived experience of many players," she told the Guardian.
The researchers point to several alternative or complementary factors. High-profile player suicides and media coverage of CTE in the 2010s may have triggered a suicide contagion effect, where awareness of such deaths increases copycat attempts. Seau's death in 2012 and the 2015 film Concussion intensified public focus on the issue. The NFL acknowledged the CTE link during a Congressional hearing in 2016. Each event amplified awareness and, potentially, despair among vulnerable players.
The diagnostic limbo surrounding CTE compounds the problem. Because definitive diagnosis requires autopsy, players can never know for certain whether they have the condition. Every headache, every memory slip becomes a potential symptom. This uncertainty itself can drive suicidal ideation, separate from actual CTE.
Beyond CTE, many players may suffer from treatable conditions that mimic or coexist with brain injury effects. Sleep apnea, low testosterone, high blood pressure and depression all produce similar symptoms: memory loss, brain fog, aggression. Some players, like Hall of Famer Tony Dorsett, were initially suspected of having CTE before receiving treatment for sleep apnea that resolved their mental health crisis. Tight end Hayden Hurst survived a suicide attempt earlier in his career and later discovered a non-CTE neurological condition from a past concussion.
Marc Weisskopf, the study's co-author, also noted that classification methods may have changed. Deaths that would have been labeled differently before 2010 may have been reclassified as suicides after that year due to increased awareness of head trauma.
The Harvard researchers emphasize that their findings do not exonerate CTE or minimize head trauma as a risk factor. Rather, they argue that suicide risk among NFL players stems from multiple simultaneous pressures: brain injury, mental health conditions, employment instability, media coverage and diagnostic uncertainty all converge at once. Isolating any single cause misses the full picture.
The practical implication is clear. When an NFL player or any former athlete struggles with suicidal thoughts, they should not assume CTE is the only explanation or the only addressable cause. Proper medical evaluation can identify and treat sleep disorders, hormonal imbalances, depression and other conditions. Some symptoms can be reversed. Others can be managed.
Author James Rodriguez: "The Harvard study doesn't downplay football's dangers, but it does suggest that treating every symptom as inevitable CTE may be missing the actual treatable crisis in front of us."
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