My wrist has been hurting for a few months off and on. What could be wrong?

For the past few months my wrist has been hurting off and on. It all started with me carrying a heavy trash bag and bending my wrist too far back. After about a week or two it cleared up. After a few more weeks my wrist started hurting again, so I wrapped it up with some gauze and rested it, which helped, and once again it stopped hurting. Finally within the past few weeks its started hurting again, even though I haven't really done much except for work. My dad thinks that it might be carpal tunnel, but it doesn't seem to match the symptoms. Does anyone have any idea what it could be? I'm still very young so I don't suspect Arthritis. Please help if you can!