Lower back pain is just above the hips and is felt as if in spine. I experienced this kind of pain, not immediately but later in my life. It is not that you have this pain for no reason. You develop it after you do certain rigorous activity that affects your back. I had to leave my favourite game because I could not cope with my back pain (as I had to bent often in the game). I believe this was one of the side affects of over masturbation. I showed this in one of the later stages. I am OK now with no back pain. One reason because I stopped masturbation long time ago.
A lot of people have back pains and they should not be assumed because of masturbation. There could be thousand reasons for it. We just discussed one reason.