The pain of IBS is usually where the colon is, so on the sides of the abdomen is common. The colon goes around the outside of the abdomen (right then top than left side) and left sided pain is really common.IBS pain may (may, not must, but may) go down after a BM, but only the part of the pain from rectal hypersensitivity (it hurts when the rectum is full). Pain at other times is not a symptom that says you can't have IBS. IBS pain can hurt all day long and can be severe. Just because it is a "functional" disease does not mean it can't be extremely painful all the time and should be just a minor annoyance. IBS ranges from mild to debilitatingly severe.Abdominal pain often goes into the back because of how the nerves run.Stomach pain (up near the chest along the midline) is not a symptom of IBS. IBS is a colon problem, not an upper GI issue. Although many people have upper GI pain as well as pain from IBS in any of the four quadrants of the abdomen as IBS can cause pain anywhere from just under the ribs to the pelvis and tends to be on the sides more than the midline.Now the joint issue may indicate something else going on (doen't have to be an intestinal autoimmune disease) but the joint issues may need to be investigated as joint issues and a colonoscopy alone may not be the only thing that needs to be done.