The former centre half, 60, said: "I used to head the ball further than I could kick it."
Hughes spoke at an event which unveiled a new report backing calls for footballers with brain injuries to access social security payments.
Ex-footballers are estimated to be three-and-a-half times more likely to die of neuro-degenerative brain conditions.
The researchers also found poor awareness of brain injury risks among figures in the game and players feeling they had to play on after getting a head knock.
Hughes said the tally of ex-players with dementia is "concerning".
He said: "There's no hiding the fact that former pros have got it."
Asked if he was scared he could be diagnosed with dementia, he said: "100 per cent."
The former...