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Bleeding that takes place in the esophagus, stomach, or the first part of the small intestine most often causes the stool to appear black or tarry. Your doctor may use the term melena.. Bleeding in the upper part of the GI tract will usually cause black stools due to: Abnormal blood vessels.
Black stool may be accompanied by other symptoms, which vary depending on the underlying disease, disorder or condition. Symptoms that may accompany black stool include: Abdominal pain or cramping. Abdominal swelling or bloated feeling. Change in bowel habits. Diarrhea. Flatulence, gas or indigestion. Flu-like symptoms (fatigue, fever, sore throat, headache, cough, aches and pains). Foul-smelling stool.