Hi. Thanks for your query. Noted the history of pain in right lower side of abdomen, under rib case, particularly after a bowel movement. Pain comes on getting off the toilet also, subsides within a few minutes, also get on getting up from the chair while working with computers... Such type of pains comes with colitis paricularly of the cecum and ascending colon. Hence I would advise you the following: Colonoscopy and biopsy. CT scan of the abdomen. Tests of the stool, urine and blood to check for any infection, anemia, diabetes, thyroid dysfuntion and so on. This along with a clinical evaluation by a General surgeon or a Gastroenterologist will get us the proper diagnosis and we can plan a proper management as per the diagnosis. You may need a course of an antibiotic, metronidazole and so on as per the findings. Once the colitis part is covered if present, you should be fine. If all the investigations are normal, this is obviously IBS that is irritable bowel syndrome and should be treated accordingly.