From sore thumbs to "Nintendo epilepsy", a team of Dutch researchers have revealed a long list of ailments caused by playing Nintendo Wii.
The findings, gathered after the researchers looked into Nintendo-related problems to conclude whether it's a safe present to give this Christmas, will be revealed in a festive issue of the British Medical Journal.
They found 38 reports of injuries and problems ranging from neurological and psychological to surgical.
Nintendo Wii bosses have reacted by stressing that customers should "pace themselves" and "not overdo it".
Here are some of the reported injuries:
1. A sore thumb (from hammering the buttons too hard).
2. A stroke. The researchers found two patients were rushed to hospital having had a stroke while playing.
3. A hernia. After exercising on the Wii Fit game.
4. Chest bleed. A 55-year-old woman suffered the bleed after falling on to her sofa while playing Wii tennis.
5. Nintendo-related incontinence. There were reports of Children unable to tear themselves aware from playing Super Mario Bros, even to go to the toilet.
6. Nintendo-neck. A child complained after playing his Game Boy for 30 minutes in a hunched position
7. Nintendo elbow. Diagnosed in a 12-year-old who played his console "a lot" for more than a month
8. 'Nintendinitis'. Complaints from pain in the thumb, hand and wrist from strenuous game play using a traditional controller with buttons or a joystick.
9. Acute Tendinitis in right shoulder. A 29-year-old suffered after playing Wii Sports for several hours.
10. 'Nintendo epilepsy'. Even reports of seizures.
The researchers, led by Dr Maarten Jalink of the University of Groningen, said: "Overall, a Nintendo is a relatively safe Christmas present.
"However, those who receive such a gift should not swing the controller too hard, they should be careful about where they play, and they should take frequent breaks."
A spokesman for Nintendo said: "The Wii video game system is often credited with getting people up off the couch. But, as with any activity, people playing the Wii system, or any other Nintendo product should pace themselves and not overdo it.
"Nintendo is committed to the safety of its customers and always includes comprehensive health and safety guidelines with its products. Provided these are followed correctly, a user should be able to enjoy their Nintendo product safely.'"