It feels like a muscle pain- like a strain but I can assure you it's not strained from physical labor. LOL! It is between the rib cage and hip, left side, a little toward the back. I sat in one position a while last night, upset over legal stuff, so I was pretty stressed/tense. I felt it when I was up moving around this morning but it gives me a sharp pain now if I turn or do something like throw something in the garbage can. I think I might stand in a hot shower a while.