Hello. I m sorry you ve been uncomfortable. It would help to have a bit more information here -- specifically your age and gender -- as some of the problems that could account for your symptoms are age- and gender-dependent. If you re middle-aged or older, your pain could be due to diverticulitis, which is caused by inflammation of small, bubble-like protrusions (diverticuli) on your colon. People in developed countries are more likely to develop diverticulosis and diverticulitis, probably due to a low-fiber diet. Bowel rest and antibiotics are usually needed to deal with diverticulitis; left untreated, diverticulitis can lead to abscess formation in the wall of your colon, bowel obstruction, or even bowel perforation. Now, if you re a woman in your childbearing years, your symptoms could be due to an ovarian cyst or pelvic inflammatory disease (bacterial infection of your pelvic organs). Ovarian cysts can twist or rupture, which often causes sharp, severe pain. Pelvic inflammatory disease is usually (but not always) accompanied by a vaginal discharge, fever and chills. Ovarian cysts may resolve on their own, but some require surgical management. Pelvic inflammatory disease requires antibiotic therapy. In any event, it would be wise to see your physician for an evaluation. I hope you feel better soon.