I have had the same problem for 3 weeks now im waiting on maybe getting a colonoscopy(waiting on doctor's orders) but i had blood,urine,and other test. all good so far. I have pain under my left rib cage comes and goes also. also stoold is loose almost all the time. hte weird thing is taht my pain was at the bottom of my left side and sometimes I still get it there but its more constant on the upper part now. I'm really startin to worry.