I have a pain in my back that is centered on the right side. It is tender to the touch and feels like a sore muscle, however, there are no outward symptoms such as redness or swelling of any kind. Now it seems to be spreading from my back around to the front of my stomach, but I don't yet have any gastro-intestinal symptoms. Any professionals with any ideas ? My wife, whom is completing her Nursing Degree, does not have a reasonable explanation. This seems to fall in the category of the Unknown/House M.D. arena.