Normal colonoscopy but blood in stool may be due to improper diet, hemorrhoids, anal fissure and other factors. 1. Improper diet: in daily diet, eating food mainly meat, lack of fiber-rich vegetables, etc., or consumption of animal blood products, iron, etc. may lead to fecal occult blood test is positive, but in fact, colonoscopy is no obvious abnormality. 2. Hemorrhoids: It is usually a substantial varicose vein mass in the perianal skin due to prolonged sedentary life, dry feces, and other factors, which will lead to increased abdominal pressure during defecation, thus resulting in the appearance of blood in the stool. There may be no obvious abnormality under colonoscopy. 3. Anal fissure: It may be a small ulcer formed after the anal canal skin layer below the dentate line is cracked due to long-term constipation, infection and other factors. When the patient defecates, the fissure will be stimulated, thus the phenomenon of blood in the stool. When there is normal colonoscopy but blood in stool, there may also be other factors, and a symptom alone cannot determine the specific cause, so it is recommended to consult a doctor for examination in a timely manner.
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