black watery diarrhea means what
Foods such as black licorice can cause black diarrhea. Photo Credit rÃÂ©glisse image by corinne matusiak from <a href=http://www.fotolia.com>Fotolia.com</a>. Black diarrhea is often the sign of blood in the digestive tract that can have multiple causes depending on where the bleeding is coming from. Locations can range from anywhere from the nose or mouth to the colon, though bleeding lower in the GI tract tends to present as blood in the stool more than as black diarrhea.