Why is My Poop Green?

3. Medical Issues That Cause Green Stools

Bacteria such as Salmonella and giardia cause digestive elimination to occur at a much faster pace, which may result in greener stools. Those with Crohn's disease may also experience green stools because the condition causes the bile to move through the intestines too quickly. Those with irritable bowel syndrome or ulcerative colitis are also prone to green stools. Small tears in the tissue that line the anus, called anal fissures, can sometimes develop following a bout of chronic diarrhea. This may cause not only green stools but bright red blood spots in the stool as well. In most cases, green stool is not a serious condition or a symptom of a life-threatening issue. However, if the individual also experiences recurring nausea, vomiting, diarrhea, or pain, physicians usually recommend testing to determine a diagnosis.