There's black residue in the stool. Is it blood?

Stool inside shows black slag situation, not necessarily stool inside the situation of blood, there may be food hygiene caused by the situation, if eating black food is likely to show these reaction symptoms, is the need to combine other clinical manifestations of the body to choose regulation, is not nervous, usually pay attention to food hygiene regulation control, eat less spicy irritant things to prevent gastrointestinal bleeding.