In order to be diagnosed with IBS, a doctor needs to ascertain the presence of recurrent abdominal pain an average of at least one day a week, says Dr. David Levinthal, a neurogastroenterologist ...

When you have irritable bowel syndrome (IBS), you may think your abdominal pain under the ribs is from trapped intestinal gas. But some of it may come from other sources. Intestinal gas results ...