What Causes Pain In Lower Left Side Of Ribs And Abdomen?

I have upper left quadrant pain. To be more specific, I ve been having mild pain in one of my lower-most ribs on the left side for over a year now.I can feel it by touching Whenever I sit or lay down but when I stand up I can t Sometimes the entire region feels sore to the touch. It is slightly painful to lie down on the left side and it gives pain when i sit or run. Immediately below the left ribs, if you press the abdomen, you can feel something popping or crackling, and there is some movement inside (its not so if you press the corresponding right side of the abdomen). the rib itself is sore and slightly painful to press. Sometimes when I bend over I feel some movement in there, like some fiber is moving.I have a gastric problem too. I had a doctor palpate my abdomen and he could not find anything. He thought it was a sore muscle or something. But I m concerned about the movement beneath the left-side ribcage.