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Blood in stool: causes, warning signs & what to do
Blood in the stool is common and often from piles or a small tear, but it should never be ignored — it can be the first sign of something serious.
Common causes of blood in stool
- Haemorrhoids (piles) — bright red on wiping
- Anal fissure (a small tear) — pain with bright red blood
- Gastroenteritis or infection
- Inflammatory bowel disease
- Peptic ulcer (black, tarry stools)
- Polyps or bowel cancer
When to see a doctor urgently
- Black, tarry stools or vomiting blood — seek urgent care
- Heavy bleeding or feeling faint/dizzy
- Blood with weight loss or a persistent change in bowel habit
- Any rectal bleeding over 40, or with a family history of bowel cancer
Frequently asked questions
Is blood in stool always cancer?
No — piles and fissures are far more common. But because bleeding can signal something serious, it should always be assessed, especially over 40 or with other symptoms.
What does black stool mean?
Black, tarry stool (melaena) suggests bleeding higher up in the gut, such as a stomach ulcer, and needs urgent medical attention.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.