bones

Hi

I have been having issues recently with bones in my body. Since i was about 12 (now 21), i have noticed bones in my body crack. It started off with just my fingers doing it but now i can list toes, ankles, lower legs, knees, lower back, shoulder, elbow, ears and neck as places where bones are cracking. What makes me worry is that for about 5 weeks now I have had pain in my lower back and left leg. Like a shooting pain (left leg) and general pain in my lower back. To get rid of the pain I have to crack the bone in order for the pain to go away. Yet 10 minuets later it will be back.

Any answers to this would be gratefully appriciated

Thanks

James