Hi,
Some of the causes:
http://ibdcrohns.about.com/cs/otherdiseases/a/greenstool.htm
Please click the green ACCEPT button if my answer is helpful to you. Click here to leave a positive FEEDBACK rating. A BONUS would be encouraging. If you need more help please feel free to ask. Take care.
Doctor
Physician for 20 years with experience in hospital patient care.