Head Injuries and Dementia: Why Prevention is Key

My son plays organised football and has been heading the ball since he was a child, and I cycle without a helmet. Do head injuries really increase the risk of dementia in the future?

The topic is being taken increasingly seriously by science — and the practical answer lies mainly in prevention, not treatment.

What is known

Head injuries, especially repeated or moderate-to-severe ones, are associated with an increased risk of dementia years or decades later. This is why the WHO includes the topic in its risk reduction guidelines — and why international sports organisations have changed rules regarding concussions and heading in youth sports.

What the WHO says — in two parts

First: measures for the prevention of head injuries should be consistently implemented — helmets, road safety, protection in sports. Second, honestly: for those who have already suffered an injury, there is not yet sufficient evidence to recommend specific interventions to reduce the risk of dementia resulting from it. In other words: after the damage, science still doesn't know how to mitigate it — all the more reason to avoid it in the first place.

The bicycle helmet: no excuses

That part of your question answers itself: wear a helmet, always. A simple fall from a bicycle at 12 mph is enough for a serious injury, and a helmet drastically reduces that risk. It is the most cost-effective prevention measure on this entire page.

What about your son's football?

There's no need for alarm, but rather informed attention: several countries now limit heading in youth training, precisely as a precaution. The most important thing is concussion management: any blow to the head with dizziness, confusion, persistent headache, or a "blackout" requires immediate stoppage and medical evaluation — and never returning to play on the same day. If the club doesn't have a clear concussion protocol, it's a legitimate question to ask. Sport does much more good than harm — the issue isn't to stop, it's to play with the protections that are now known to be necessary.