I am experiencing discomfort in my left hip and as well as my left knee. Could this be caused by a back issue? I know I don't have the proper distance between L5 and S1 on my spine and I have taken a muscle relaxer for the discomfort but it still doesn't reduce any of the discomfort. I haven't been able to sleep the past two tonight's because the pain intensifies when I'm in a stable position. Could someone kindly let me know if these are common symptoms of back pain or could this be caused buy something else such as an infection?