A 24-year-old woman comes to the office because of intermittent
diarrhea and crampy abdominal pain over the past year. During these episodes, she notices an increased frequency of bowel movements and softer stool consistency. Her symptoms get worse with stress and improve when she takes loperamide. The abdominal pain is decreased after defecation. She denies bleeding, weight loss, early satiety, family history of colon cancer, and smoking. Esophagogastroduodenoscopy and colonoscopy with biopsy are unremarkable. Which of the following is the most likely diagnosis? Crohn disease. Functional dyspepsia Gastroenteritis. Helicobacter pylory gastritis. Irritable bowel syndrome. .
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