Green stools alone are not an indication of any medical problems. In fact, most stools have a tinge of green because of bile and hemoglobin staining the stool. The most likely explanation for green stools is eating green objects in the diet like vegetables. However, if you are experiencing fevers/chills, diarrhea, weakness, nausea, vomiting, and/or weight loss, then you should be evaluated by your medical doctor for possible conditions.