There can be a number of things causing your child's back pain. It would be best to have them evaluated by a chiropractor. A chiropractor will be able help pinpoint the cause of the child's pains. If chiropractic care is appropriate then a chiropractor can safely treat the child. Kids respond very well to chiropractic care. They have much less scar tissue and adhesions than adults so the treatment is usually much less invasive and quicker. In the meantime make sure the child is having good posture. Such as a good place to study or use electronics that isn't causing them to hunch. You can also use some ice on the area for 20 minutes at a time in the meantime.