Introduction
Seeing blood in the toilet bowl is alarming. A 10-minute outpatient examination is usually all it takes to know whether it is harmless or needs further evaluation.
This guide explains what different colours and patterns of bleeding usually mean, the warning signs that should never be ignored, and what an evaluation actually involves.
What does blood in the stool mean?
Blood in the stool simply means that somewhere along the digestive tract, a blood vessel is leaking. Where it is leaking from determines what colour you see. Bright red blood usually comes from the lower bowel. Dark red or maroon blood usually comes from higher up in the colon. Black, tarry stool (melaena) usually comes from the stomach or small intestine.
Causes range from benign conditions to polyps, colorectal cancer, inflammatory bowel disease and diverticular disease.
The point of evaluation is to make sure the patients who have something serious are caught early, when treatment is most effective.
Symptoms & when to seek help
- Bright red blood on the tissue or in the bowl after defecation
- Bright red blood mixed with the stool
- Dark red or maroon blood mixed throughout the stool
- Black, tarry stool (melaena)
- Blood with mucus
Causes & risk factors
- Colon polyps
- Colorectal cancer
- Inflammatory bowel disease (ulcerative colitis, Crohn's)
- Diverticular disease
- Infections (rarely)
How it is diagnosed
- Outpatient consultation and external examination
- Digital rectal examination
- Colonoscopy when the bleeding pattern, age or risk factors warrant it
- Stool tests for occult blood and infection
- Blood tests for anaemia and iron status
Treatment options
- Polyps: removed during colonoscopy in the same sitting
- Cancer: stage-appropriate surgery, often combined with chemotherapy or radiation
- Inflammatory bowel disease: medical treatment by a gastroenterologist, surgery for selected cases
Recovery & aftercare
- Polyp removal at colonoscopy: home the same day, normal diet the next day
- Cancer surgery: 5 to 7 day hospital stay, return to office in 4 to 6 weeks
- Long-term follow-up depends on the cause
Risks of delaying care
- Iron-deficiency anaemia, which causes fatigue and reduces work capacity
- Polyps progressing to colorectal cancer over years
- Early-stage cancer progressing to advanced stages, where treatment is harder
- Persistent bleeding from any cause affects quality of life and energy
Frequently asked questions
Reviewed by
Dr. Sanjay Yadagiri
Consultant - Minimal Access Surgery & Surgical Oncology
Over three decades of surgical practice. UK-trained, France-certified in laparoscopic and colorectal surgery. Now practising as an Independent Consultant in association with several reputed corporate hospitals in Hyderabad.
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