What are some causes of chronic diarrhea?

Laundry list: Here is a laundry list for causes of chronic diarrhea: crohn's disease, ulcerative colitis, irritable bowel syndrome, celiac disease, lactose intolerance, fructose intolerance, parasitic infestation, bacterial infection, postcholecystectomy syndrome, laxative abuse, food allergies, gastrointestinal hormone secreting tumor, hyperthyroidism, constipation, etc. Best advice is to seek medical consult.