Well my back pain comes and goes. 1 month it hurts then doesn't hurt for another 3 months or so. Recently during Thanksgiving week my back was hurting so much that i couldn't get out of bed. Whenever I would try to turn side to side or bend over it would hurt with intense pain. My uncle says he has the same problems at times and he says its because of our spines, there is a little disk shape on the bottom of our spines and supposedly it is smaller than most peoples' (he went to a doctor for his back and the doctor said that) and he said it's genetic.
I do weightlifting as well but nothing intense on the legs or back. I mostly work out my upper body but don't do squats since my dad says that can stop my growth (height wise).