In case of gastrointestinal bleeding, the stools are usually black, i.e., the presence of asphalt-like stools or black stools that look like haematochezia are usually considered to be upper gastrointestinal lesions. By upper GI lesions, we mean lesions above the esophagus, stomach and duodenum are considered upper GI bleeding. However, some bleeding in the upper part of the small intestine, when the bleeding is small and the bowel movements are slow, can also appear as black stools. In the case of lower GI bleeding stools, the color is usually more reddish, i.e. slightly darker red.