I think the pressure in part of the colon counts as "pain or discomfort". the part of the colon that is the source of the pain/discomfort does NOT in any way rule IBS in or out. It is anywhere along the whole length of the colon including the sigmoid portion of it.Could it also be because you can't relax your sphincter so stuff is not being released when it should be, causing you to feel backed up and overly full?Usually the end of the small intestine causes pain on the right side more than very low in the middle (based on people with crohn's who do have pain originating from the last part of the small intestine)K.