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What should you know about black green stool?

Where Black Stools is typically felt, shown on a simplified body outline
Illustration: Where Black Stools is typically felt, shown on a simplified body outline

Short answer

Black-green stool may come from food, iron or bile, but tarry black stool can indicate bleeding in the upper digestive tract and needs prompt medical assessment.

This answers one question. It is not a diagnosis and does not replace an assessment by a licensed doctor.

At a glance

Possible harmless triggers
Food colouring, leafy foods or iron
Concerning appearance
Sticky, tar-like black stool
Key action
Seek urgent care with bleeding symptoms

What the colour can mean

Green food colouring, leafy vegetables, iron supplements and some medicines can darken or green the stool. Bile can also look green when stool moves quickly through the bowel. Black stool that is sticky, tar-like or unusually foul-smelling is different from ordinary dark food-related stool and may reflect digested blood. Stomach inflammation, Helicobacter pylori infection and a peptic ulcer are possible digestive causes; these conditions do not explain every episode, so colour alone cannot identify the cause.

What to do now

Notice whether the change followed iron, a new medicine or strongly coloured food, and record its texture and how often it occurs. Do not stop a prescribed medicine without advice. Arrange medical advice if the black colour is unexplained, returns, or continues after the suspected food or supplement is no longer being used. A clinician may ask about medicines, abdominal symptoms and may arrange stool or blood tests.

When to seek urgent care

Seek urgent medical care for tarry black stool, repeated black stools, vomiting blood or material resembling coffee grounds, faintness, marked weakness, shortness of breath, severe abdominal pain or a racing heartbeat. These can accompany digestive bleeding. Do not wait for the colour to settle if you feel unwell.

Questions for your doctor

Ask whether your medicines or supplements could account for the colour, whether testing is needed, and which changes should prompt immediate review. Mention any stomach pain, nausea, dizziness, weight change or previous ulcer symptoms.

Find care

General Clinics & Polyclinics in Abu Dhabi

That answer is general. If you want it applied to your own case, these are licensed general clinics & polyclinics listed in Abu Dhabi.

City
See every listing in Abu Dhabi

Ordered by verification status and how complete each clinic's public record is, then alphabetically. This is a directory listing, not a ranking — Zavis does not rate or recommend providers.

A factual listing drawn from the DHA, DOH and MOHAP licence registers. It is not a referral, an endorsement, or advice that any of these providers is right for you.

Questions people ask

Can green food make stool look nearly black?

Yes. Strongly coloured foods can darken stool, while bile may add a green tone. Texture and accompanying symptoms still matter.

Is black stool always bleeding?

No. Iron and some foods can darken it, but unexplained tarry stool should be assessed promptly.

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Medical disclaimer. This page is general health information, not medical advice, and it cannot diagnose you. Always consult a licensed healthcare provider about your own symptoms and treatment. In an emergency in the UAE, call 998 for an ambulance.