Bleeding stools during breastfeeding are often caused by the following reasons: 1. Hemorrhoids: After childbirth, you are prone to constipation, which can then easily lead to hemorrhoids. When hemorrhoids are severe, there will be bleeding after stool, usually in the form of drops, without obvious pain. You can go to the general surgery department of the hospital, or the anorectal surgery department for clarification. If the disease, you need to actively adjust the diet, and then with the drug sitz bath treatment, bleeding can gradually stop. 2, anal fissure: after defecation, there is bleeding, and there will be severe pain in the anus, you can do anal finger diagnosis, and anoscopy for clarification. If conservative treatment is ineffective, surgery is needed. 3. rupture of intestinal malformation: colonoscopy is needed to clarify. 4. other: some patients are caused by polyps or even malignant tumors growing in the intestine, which also need to clarify the cause as soon as possible.