Last source review
August 19, 2026. Sources are linked directly so readers can check the original guidance.
NIDDK: Symptoms & Causes of Proctitis
Blood, mucus, pus, rectal pain, urgency, and causes of proctitis.
NIDDK: Ulcerative Colitis
Diarrhea, rectal bleeding, pain, mucus, pus, and urgency.
NIDDK: Irritable Bowel Syndrome
The core IBS pattern of abdominal pain and altered bowel movements.
CDC: C. diff clinical overview
Antibiotic-associated diarrhea, risk factors, symptoms, and diagnosis.
NHS: Bleeding from the bottom
Urgent guidance for black or dark red stool and bloody diarrhea.
Mayo Clinic: Mucus in stool
Normal mucus and situations in which increased or bloody mucus matters.
Mayo Clinic: Diarrhea, when to see a doctor
Duration, dehydration, fever, pain, bloody stool, and black stool.