The following are causes of secretory diarrhea except
Causes of chronic diarrhea: 
1.Osmotic diarrhea—clues—stool volume decreases with fasting, increased stool osmotic gap;
(i) Medications—antacids, lactulose, sorbitol,
(ii) disaccharidase deficiency—lactose intolerance,
(iii) factitious diarrhea—magnesium (antacids, laxatives).
 
2. Secretory diarrhea—clues—large volume (>1 L/day), little change with fasting, normal stool osmotic gap;
(i) hormonally mediated—vipoma, carcinoid, medullary carcinoma of thyroid (calcitonin), Zollinger—Ellison
syndrome (gastrin),
(ii) factitious diarrhea (laxative abuse), phenolphthalein, cascara, senna,
(iii) villous adenoma,
(iv) bile salt malabsorption (ileal resection, Crohn’s ileitis, postcholecystectomy,
(v) medications.
Vibrio cholera
Inflammatory bowel disease
Lactose intolerance
Gastrinoma