IBS is a bit uncommon term to people.IBS stand for Irritable Bowel Syndrome .It is a very rear kind of syndrome among peoples ,all around the world near about 10% peoples are suffering with IBS. The common symptoms of IBS are diarrhea , constipation, abdominal discomfort and pain. It's bit difficult to diagnose IBS but still these are some tests you can do to diagnose IBS like breath test, colonoscopy, endoscopy etc.