BarcelonaFew televised images are more distressing than that of a football player lying on the turf after being hit in the head on a defensive tackle. And there is none more euphoric than a header that goes on the scoreboard in the last minutes of the match. Although football is played predominantly with the feet, the head plays a very important role. Now, a retrospective study by the Hospital Clínic de Barcelona warns of the serious consequences that repeated blows can cause in professional footballers decades after retiring, which can start with a sleep disorder and, in some cases, lead to in a neurodegenerative disease such as dementia. According to the authors, having played football cannot be considered a risk factor as such, at least for the time being, for these pathologies based only on the results of their study, but they do warn that the proportion of ex-football players affected by any of both diseases is significant with respect to the general population and this line of research requires deeper analyses.