Stool test for red blood cells indicates whether there is blood in the stool. Routine stool examination, normally 0 red blood cells/HP, greater than 1/HP suggests an abnormality. Common causes include upper gastrointestinal diseases: upper gastrointestinal bleeding, gastritis, gastric ulcer. Lower gastrointestinal diseases: ulcerative colitis, hemorrhoids, tumors, etc. and systemic diseases, such as leukemia, hemophilia, thrombocytopenic purpura, etc. and the application of glucocorticoids, aspirin, etc. damage to the intestinal mucosa, the routine red blood cells can also appear. Patients with routine red blood cells should be combined with stool, blood, their own symptoms and medications taken to determine the synthesis, if necessary, gastroenteroscopy. A single indicator is of little clinical significance, can not be judged to be a certain disease, it is recommended to go to the hospital, follow the doctor’s instructions to give the necessary examinations and related treatment.