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EasyGastroenterologyIrritable bowel syndromeus-abfmus-abimus-usmle-step-2

A 46-year-old woman presents with chronic intermittent diarrhea, abdominal pain relieved by defecation, and no weight loss or blood in stool. Colonoscopy is normal. Symptoms have been present for more than 6 months and are associated with change in stool form and frequency. What is the most likely diagnosis?

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