The causes of mucus mixed with a little bit of blood on stool generally include malignant lesion, bleeding disease and inflammatory disease. 1. Malignant lesions: once the local intestinal mucosa of colon cancer patients is destroyed, it will cause mucus-like and bleeding changes in stools, resulting in some blood in stools, or even black or tar-like changes. 2. Bleeding disease: if gastrointestinal bleeding, it will also cause mucus and blood changes in stool; hemorrhoidal bleeding, it will also cause blood on the surface of stool, and it is usually fresh blood or fresh blood drops after stool. 3. Inflammatory lesions: such as inflammatory bowel disease and ulcerative colitis, may also cause mucus pus blood. In addition, acute infectious diarrhea may also cause mucus stools, accompanied by blood. Patients are advised that it is necessary to go to regular hospitals to receive relevant examinations, and according to the results, treatment under the guidance of specialists.