Hi,
Welcome to the ehealthforum and I am really glad to help you out.
Chronic diarrhea can be due to parasitic infestations. Other causes are irritable bowel syndrome, celiac disease, crohnâs disease, malabsorption syndromes, pancreatic diseases, diabetes, hyperthyroidism etc. Since you have IBS, hence it can be responsible for the chronic diarrhea.
Treatment includes addition of more fiber in your diet,cessation of smoking and taking stress,antispasmodic medicines,antidiarrheal medicines,antidepressants and new medicines like Alosetron (Lotronex) and Tegaserod (Zelnorm).
You can consult a gastroenterologist and get it evaluated.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.