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Bright orange specks may show up in your bowel movements, though this should not actually color your bowel movements orange. Dr. Paredez continues, âOrange diarrhea may be the result of infectious diarrhea, which causes rapid transit through the intestine, which limits the amount of bile in the stool. Bile duct cancer and pancreatic cancer are the life-threatening medical conditions that can result in orange diarrhea.
Black stools can be due to iron supplements or excess iron in the diet. The most serious cause of black stools is bleeding in the GI tract, due to ulcers or some other cause. If the stool is black due to blood, it usually has a tarry feel. If there is just a black color, most likely it is not blood.