What's wrong with my bones?

For several months my thumb would hurt for a couple days every month or so. It felt like it was sprained or broken. It would go away... and come back a couple weeks or months later. My thumbs don't hurt much anymore, but now it's my wrists. Both of them have been hurting but not always at the same time. It also feels like they're sprained, but sometimes its less pain than usual. A couple days ago my ankle started to feel this way, but didn't hurt too bad. And my knee, but just for a day or so. Could it be that I need more calcium? I have no clue. Thanks.