Computer games consoles which vibrate could be bad for your health if you play them for too long, according to a group of doctors.
The warning comes after a 15-year-old boy developed a painful condition known a 'hand-arm vibration syndrome.'
He'd spent seven hours a day playing computer games, especially those using the vibration mode on the control device.
He had to go to hospital with painful hands, which became white and swollen when exposed to the cold and then red and painful when they got warm.
He also suffered from pins and needles in his hands and arms.
It's a disease more common amongst people who work with heavy machinery such as pneumatic drills.
The doctors want warning labels put on consoles.
But Sony, who make the hugely popular Playstations 1 and 2, says it hasn't heard of any injuries like that from its products.
And it stresses that each game comes with a reminder to take 15 minute break during each hour of play.