There are many causes of blood in the stool: 1. Gastrointestinal bleeding, blood in the stool due to ulcers and inflammation of the gastrointestinal tract or intestinal tumors, anal fissures, dry stool abrasions, etc. Usually the proximal digestive bleeding is bright red and the distal is black or coffee. 2. Hemorrhoids, bleeding from hemorrhoids is caused by feces rubbing the bulging varicose hemorrhoidal vein during defecation and force during defecation, causing the hemorrhoidal vein to rupture, resulting in blood in the stool. This condition is usually preceded by stool and followed by bleeding drops. Repeated bleeding many times tends to make the body lose a lot of iron, causing iron deficiency anemia, so hemorrhoids blood in stool should be treated promptly. There is also a cause for vaginal bleeding in women, and it is recommended to go to a gynecologist for a detailed examination.