Does heading the ball frequently in football, or sustaining a concussion, increase my risk of dementia later in life?
Professional footballers who head the ball frequently have a considerably higher risk of dementia than goalkeepers or people without an elite sporting background. The same applies after a concussion involving memory loss.
The strongest evidence comes from a large Swedish study involving more than 6,000 elite footballers and over 56,000 people from the general population1. Outfield players had a 50% higher chance of developing a brain disease and nearly 62% higher chance of developing dementia. Goalkeepers, who head the ball far less often, had no significantly elevated risk. That difference points to heading as the connecting factor, although this type of research does not yet prove a direct cause.
How often you head the ball genuinely matters. In a study of 459 retired male professional footballers, players who headed the ball more than 15 times per match had more than three times the risk of cognitive decline compared with players who rarely headed it2. A smaller study of 60 English former professionals confirmed this: a greater number of headers over a career predicted worse memory scores, whereas ordinary head injuries did not3. Both studies rely on self-reporting, which can be inaccurate.
A concussion involving memory loss also raises the risk. That same study of 459 former professionals found a more than threefold increased risk for this outcome2. Repeated concussions may increase the long-term risk of cognitive decline. Repeated mild impacts without concussion are also considered a possible risk factor4.
At autopsy of six deceased professional footballers who had dementia, CTE was found in four of them. CTE is a brain disease linked to repeated blows to the head5. This is, however, a small, selected group. You cannot conclude from this how often CTE occurs in footballers in general.
Not every study agrees. An early study of 92 retired professionals found no significant association between heading behaviour and cognitive decline6. That study was, however, too small to draw firm conclusions. Importantly, all data concern professional male players with years of intensive exposure. You cannot infer from this whether recreational players or women face the same risk.
All claims are based on studies with PMIDs 36934741, 37459095, 34708914, 28205009, 28387556 and 24026299. The large Swedish cohort study (PMID 36934741) is the most robust source. The remaining studies are small-scale or cross-sectional and partly rely on self-reporting. No single study conclusively proves causality. Women and recreational athletes are barely represented in the available data.