Thank you for that info - after reporting my symptoms to my oncologist, he suggested that I needed to replace electrolytes (gator aid)...which I did for a month with no results. I will be seeing my family doctor in about two weeks and will report this info to him. Fortunately, it does not affect my everyday life, except when I roll over in bed and bend over to pick something up. I love this very informative website and being in touch with others who have experienced similar issues.