Stool hematochezia, how is this to return a responsibility ah

Hematochezia is very common. Hematochezia has upper gastrointestinal bleeding and lower gastrointestinal bleeding. If stool color is dark, blood mixed in feces may be upper gastrointestinal bleeding, such as gastric ulcer, gastric perforation, etc. If blood is blood, it may be anal fistula and hemorrhoids.