What is the reason for the dark color of stool?

Stool color deep has the following several reasons: First, digestive function decline or suffering from acute gastroenteritis may cause the color of stool to turn green, and with sour smell; Second, intestinal polyps or colon tumor patients are easy to show stool with blood phenomenon, this situation stool generally shows dark red; Third, if there is more serious anemia or dysfunctional anemia, the patient with poor coagulation function in the body will show blood in the stool, causing the stool to turn dark red; Fourth, if the digestive tract bleeding is shown, the stool will also turn black; Fifth, eating a large number of animal viscera, spinach and other darker foods may also cause the color of the stool to deepen.