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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.

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Common causes of blood in stool

When to see a doctor urgently

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.

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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.