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Black (tar) colored stools and Diarrhea. WebMD Symptom Checker helps you find the most common medical conditions indicated by the symptoms black (tar) colored stools and diarrhea including Gastrointestinal bleeding, Medication reaction or side-effect, and Food poisoning. There are 47 conditions associated with black (tar) colored stools and diarrhea. The links below will provide you with more detailed information on these medical conditions from the WebMD Symptom Checker and help provide a better understanding of causes and treatment of these related conditions.
In the case of hematochezia, the blood may coat the stool, be mixed in with the stool, or even be passed by itself without any stool at all. Potential causes of black colored stools include: 1  acidified blood (blood from higher in the digestive tract)  iron supplements or foods high in iron.