Clinically, the color of lower gastrointestinal bleeding varies depending on the patient’s specific bleeding site. Usually, clinically, if the patient is bleeding from the sigmoid colon, the patient’s bleeding should be brown stool mixed with or sticky with blood, and the patient’s stool is usually not too dark in color. In addition, if the patient is bleeding from the rectum or anus, it is usually a large amount of bright red blood. If the patient is bleeding from the right side of the colon or small intestine, the patient’s bleeding is usually black. The patient’s bleeding will vary depending on the amount of bleeding the patient has. If the patient is bleeding from the small intestine, the bleeding is large and rapid, then the color may also appear bright red. In addition, for lower gastrointestinal bleeding, prompt hemostatic treatment should be given. In addition, colonoscopy can be done to clarify the exact site of bleeding in the patient.