Can cronic diarrhea be caused by a functional gastro desease. a lot of tests have been done, concluded just as funcional. any advice on treatment?

Irritable bowel?: This is a problem which needs professional approach, and not being aware of what has already been done makes it very difficult to give advice. Would like to know how often the diarrhea, what the stools look like, what type of doctor you are seeing. Suggest a good gastroenterologist.

Absolutely. : A very common cause. Variety of medications available such as anti-diarrheals or anti-spasmotics. Speak with your doctor.