Hello, I just went to the bathroom and for the second consecutive day I pooped a dark green hard stool . I am not taking any antibiotics or any other drugs . I didn t have a surgery recently either (never, actually). It was hard, not diarrhea . I don t have any pain or any other symptoms such as those related to IBS and the like. I read somewhere that it can be caused either by ingestion of large amounts of leafy greens (which I have t had recently either), decreased bowel transit time (but the stool was hard, not soft), some diseases such as IBS, Celiac disease, Ulcerative colitis, Crohn s disease, Malabsorption (whose painful symptoms I really don t have) or.... cancer :((( please explain.. what kind of cancer causes hard green stool? Thank you