Left shoulder, yes, I had that for a long time and never related it to the kidneys. It was always a giant knot in the shoulderblade. Now anytime I get it there I know I am suffering toxic overload and give the kidneys some help - the are teas (banaba), barefoot herbalist has a tonic, salt flushes, etc. Sometimes if you are doing a detox program it is good to lay off for awhile until the kidneys are clear, give it a few days and try to flush them while you rest. I wasted a lot of money at the chiropractor before I understood it was not something he could fix. Other places that are telling can be the left hip, knees, thumb joint, feet, etc.
I am happy to report I can wear ALL the shoes in my closet again, and I was down to one or two pairs. =)