My left wrist popped out and popped back in 2 months ago and it still hurts. what could be wrong with it?

While in anat & phys, i pick up something heavy and my wrist popped out and when i let go of the item, it popped back in. It hurt really badly the next week of 2 weeks. It went away for 1 week and now its been killing me every since. And I just want to know the possibilities of what's wrong with it and if its serious enough to get x rays.