For the last couple of months, I ve had discomfort and mild pain in the upper, left portion of my abdomen. It seems to come and go. For a week or more I had no sensation of pain or discomfort, but it has returned. I keep trying to find a lump or internal growth that I can feel with my hand, but I can t feel anything but a smooth surface. The sensation at times feels like something inside is expanding or swelling. When I bend, it feels like I am compressing something and it rolls under pressure. The location feels like is is below my rib cage, on the left side of the front of my belly. I am over weight. 5 ft. 10 in. 257 lbs. My appetite is not affected. Any thoughts?