Under right rib about 2 inches and only on my right side. Doesn't hurt when I sit or lay down. It's a pinching dull pain and it goes through to my back at times too. I have been checked for appendix problems ... none! What can it be? The back pain is straight behind where the abdominal pain is. This has been bothering me for 3 months but the last 2 days I've had some bright red boos in my bowel movements. I'm scared now... please help in any way.