Football dementia risk evidence grows, but studies stop short of proof

Football dementia risk is drawing fresh scrutiny after preliminary research presented at the Alzheimer's Association International Conference in July 2026 found brain and mood differences in former professional players. The findings add to evidence that years of heading, tackling and collisions in sport may be linked with later neurological problems, while researchers say the studies do not prove cause and effect.

The preliminary study examined 142 former professional footballers ages 30 to 60 and 56 similarly aged people with no history of contact sports or repeated head impacts, according to research described by Eef Hogervorst in The Conversation. The two groups had similar results on objective cognitive tests measuring skills such as memory, attention and decision-making, but the retired players reported poorer mood, more anxiety and worse cognition.

MRI scans were available for 124 former players and 40 nonplayers. On average, the footballers had less gray matter in several brain areas involved in memory, attention, decision-making and emotional control. Gray matter is brain tissue that contains many nerve cells involved in processing information.

Hogervorst said the results need caution because they are preliminary, have not gone through full peer review and reflect one point in time. Researchers would need to follow participants for years to see whether symptoms or brain changes worsen.

Does heading a football raise dementia risk?

Heading is one possible factor in football dementia risk, according to research cited by Hogervorst. In a separate analysis of 459 retired footballers, players who recalled heading the ball more than 15 times in a typical match or training session had more than three times the adjusted odds of cognitive impairment compared with those reporting five or fewer headers.

That finding does not establish a safe or unsafe cutoff. Hogervorst noted that former players were estimating exposures from careers that often ended decades earlier, and the study used broad exposure categories.

In a 2020 study, Hogervorst said her team compared questionnaire responses from 468 retired male professional footballers with responses from 619 men in the general population. Of those, 326 former players and 395 controls also completed telephone-based cognitive screening tests for dementia.

The former players were generally healthier, with lower reported rates of diabetes, high blood pressure, high cholesterol, smoking and diagnosed depression, but they had sustained more concussions and serious head injuries. Their average performance was similar on some cognitive tests, yet they scored worse on measures including verbal fluency and everyday functioning.

After accounting for factors such as age, education, hearing loss and health conditions, former players had about twice the odds of falling below established dementia screening cutoffs on verbal memory and verbal fluency tests, according to Hogervorst. A screening cutoff flags people who may need further clinical assessment; it does not diagnose dementia.

Large studies of former professional footballers in Scotland and Sweden also found higher rates of dementia or other neurodegenerative diseases among outfield players, while goalkeepers did not show the same clear increase. The Scottish research found the highest risk among defenders, who generally head the ball more often.

What do the findings mean for players now?

The evidence also extends beyond football. Research on former elite rugby players has raised concerns about repeated blows to the head, and Loughborough University researchers using instrumented mouthguards found that greater head-impact exposure during matches was associated with more symptoms of low mood, anger, fatigue and anxiety in young elite players.

The Football Association’s guidance for the professional game recommends no more than 10 higher-force headers in a training week, including headers from long passes, crosses, corners and free kicks. Its concussion guidance says any player suspected of concussion should be removed immediately, should not return the same day and should receive medical assessment before a gradual return to activity and football.

Hogervorst said football has physical, social, health and psychological benefits. The evidence supports reducing avoidable head impacts, treating concussion properly and monitoring players during and after their careers.

This story draws on original reporting from Medical Xpress.