Differential diagnosis of chronic diarrhea

​Differential diagnosis of chronic diarrhea are : 
-laxative abuse 
-alcohol 
-caffeine 
-adrenal insufficiency 
-ischemic colitis 
-parasites 
-lactase deficiency 
-irritable bowel syndrome
-osmotic diarrhea 
-malabsorption 
-motility disorders 
-chronic infections
-inflammatory conditions 
-secretory