How is irritable bowel syndrome diagnosed?

Clinically ... Irritable Bowel Syndrome (IBS) is characterised by abdominal pain, bloating and a change in bowel habit, or frequency present for at least 6 months. The pain is often eased by passing a stool, symptoms may be worse with eating. Your GP will take a history, examine the abdomen and likely order some blood tests to exclude other causes of abdominal pain and altered bowel habit. See
Irritable bowel synd. Irritable bowel syndrome (IBS) is relatively benign compared to inflammatory bowel disease (IBD). IBS is diagnosed clinically based upon Rome or Manning criteria ( Depending upon age & other risk factors, some invasive testing eg colonoscopy may be performed but often diagnosis made clinical.