Hi,
Welcome to the ehealthforum and I am 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.
In your case, it is important to rule out any parasitic infestations for which i suggest you to get a stool examination done.
I sincerely hope that helps. Take care.