There are concerns about kids damaging their arms and necks because of too much texting or time spent in front of the computer.
Newsround picked up these top tips from doctors.
Here's our guide to keeping the aches and pains away.
Every 40 minutes take a five minute break away from the computer
Do some exercise - such as running - every day
If anything hurts, tell your parents or your doctor
Try to keep your back straight in your chair
Keep your arms close to the keyboard, with your arms bent
Try these exercises during your breaks from the computer:
Tap the end of your thumb against the end of each finger in turn on both hands twice on each hand
Try to stretch your arms and hands out in front of you and hold with your fingers pointing straight forward (like superman) for a count of 15, then relax and drop your arms
Wrap an ice pack (or bag of frozen vegetables) in a towel and put it over the tender spot for 10 minutes. Then repeat one to two hours later