Comquay,In clinical terms, IBS is a functional bowel disorder of the gastrointestinal (GI) tract. The GI tract includes your mouth, esophagus, stomach, small intestine, large intestine, gallbladder, and anus. So, the problems associated with IBS could be caused by any or all of the parts of the GI tract.Common symptoms associated with IBS include: diarrhea, constipation, or alternating between diarrhea and constipation; abdominal pain; bloating or distention of the abdomen; gas; and, whitish mucus in stool can be common. Symptoms that are not indicative of IBS include abdominal pain that interferes with sleep, blood in stool, weight loss, fever, or diarrhea that wakes you from sleep.Irritable Bowel Syndrome (IBS) is a diagnosis of exclusion, meaning that IBS is diagnosed when all other possible diseases of the GI tract - like IBD, diverticulitis, and gall bladder disease - have been ruled out. Many of the symptoms that I have listed as being common to people with IBS can also be symptoms of other GI disorders and it isn't until all other potential diseases are ruled out that an IBS diagnosis is made. While frustrating for the patient, a proper IBS diagnosis can take months or years.You say you had a normal virtual colonoscopy. That's good, but doesn't necessarily rule out IBD. For a true reading of the intestine biopsies (tissue samples) need to be taken from various sections of the colon that are then studied in a lab under a microscope - this cannot be done with the pill, or virtual, scope. While IBD typically is made up of Ulcerative coltiis or Crohn's disease, there is also a subcategoy of IBD known as microscopic colitis and this is diagnosed when the biopsied tissues show inflammation when looked at through a miscroscope. The symptoms that you have described here, however, do sound indicative of IBD to me.Elizabeth