What does it mean when your stool is pasty, green colored? i have ibs also.

Multiple factors:: bile from liver or gallbladder disease,infection or inflammation of the GI tract. You need an exam, abdominal ultrasound, blood testing and stool analysis with bacterial culture.

Normal variation: The color of poop is derived from the waste pigment that end up in the bile, which is added to the intestines from the liver. It starts out an intense green & over time may change thru yellow to brown. The germs of the intestine convert the pigment as it transits the digestive tract. The less germ action the less color change.Loose stools are often a greenish color for this reason.