Hi, I'm not sure, but I started having pain on my lower left of my side on the back and now it's on the right lower right side. The pain comes and goes, but it's been hurting all morning and afternoon. I was looking at the other forums of Kidney stones, but seem to not have any of the symtoms...what can it be? I'm not sure if I should go see a doctor immediately or not. I've had my appendix taken out two years ago...I didn't have any symptoms at all..only stomach pains, and at the end they ran some test and found that it was the appendix. Please let me know.