A little bit of stool for a while may be caused by ulcerative colitis, acute gastroenteritis, colon cancer, pelvic inflammatory disease and other reasons. 1. Ulcerative colitis: autoimmune disorders and other factors can lead to chronic non-specific inflammatory exudation of the colonic mucosa, which can cause diarrhea, abdominal pain, acute and chronic pain, mucus, pus and blood stools and other symptoms, resulting in a little bit of stool. 2. Acute gastroenteritis: eating unclean food leads to virus, bacteria and other pathogenic microorganisms infection, causing gastrointestinal mucosa damage, acute inflammatory exudation, congestion and other lesions, and so on, so this symptom will appear. 3. Colon cancer: malignant proliferation of cancer cells after colon cancer leads to local occupation, bleeding, erosion and other changes, digestive dysfunction, so this symptom will appear. 4. Pelvic inflammatory disease: after pelvic infection, the inflammatory reaction of female patients involves the pelvic wall and the neighboring rectum, which stimulates the rectum to contract and causes this symptom. The stool may pull a little bit for a while and a variety of factors, serious cases are recommended to consult a doctor for a clear diagnosis.