<human>: I'm only 19, and I'm a guy. Back a year and a half or so ago I got some severe knee pain in both knees. I believe they were brought on by injuries, but now I'm not so sure. (One was a puck to the knee, the other was trampoline problem.) 

I went to the doctor, and he told me that it was tendinitis, though I wasn't completely sure I believed him. As the months have gone on, I now have problems in more joints. It's moved from just being my knees to now being my knees, groin, elbows, wrists, and one of my hands. 

Though I know it's possible to injure all of these, it seems unlikely. I'm in good shape, and can't really figure out what's going on. There's popping and grinding going on where there wasn't before.

I've been to a doctor and don't have Rheumatoid arthritis. I've thought about getting tested for lyme disease, but I think that's unlikely, because I haven't noticed any other side effects. What is the next step? I could wait, but after this long, it seems like it's only going to get worse from here. 

I know this is long, but what would you recommend from here?

Summarize the given text in a few sentences.
<bot>: Joint problems that started in just one joint, but have circulated throughout body. Don't have rheumatoid arthritis.