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What should you know about half black 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

Partly black stool may come from food or medicine, but sticky tar-like black stool can signal digestive bleeding 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

Concerning appearance
Black, sticky, tar-like stool.
Possible non-bleeding cause
Iron, bismuth, or dark foods.
Emergency symptoms
Faintness, weakness, vomiting blood, or clammy skin.

Possible explanations

Stool that is truly black, shiny, sticky, or unusually foul-smelling can contain digested blood from the stomach or upper intestine. Irritation such as [Gastritis](/conditions/gastritis/), a [Peptic Ulcer](/conditions/peptic-ulcer/), or infection with [Helicobacter Pylori Infection](/conditions/helicobacter-pylori-infection/) can be associated with this type of bleeding. Iron tablets, bismuth medicines, and very dark foods can also change stool colour without bleeding.

A sharp boundary between brown and dark stool may reflect uneven mixing or a recent change in what you ate, but appearance alone cannot safely identify the cause. Note texture, smell, timing, and any accompanying symptoms.

What to do next

If the colour change is new, photograph it for your clinician if practical and list medicines, supplements, and recent foods. Do not stop prescribed medicines without advice. Arrange prompt medical review if black stool returns, persists, or appears tarry, particularly if you take blood-thinning medicine or anti-inflammatory pain medicine.

When to seek urgent care

Go to urgent care for black tarry stool with dizziness, fainting, marked weakness, shortness of breath, abdominal pain, vomiting blood, or pale clammy skin. These can accompany significant blood loss. Do not drive yourself if you feel faint; ask someone to help or call emergency services.

Questions for your doctor

Ask whether you need an examination, blood tests, stool testing, or a camera test of the digestive tract. Tell the clinician about changes in bowel colour, pain, vomiting, prior ulcers, and every medicine or supplement you use.

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

Is half-black stool always bleeding?

No. Food and medicines can darken stool, but tar-like black stool may represent digested blood and should be assessed promptly.

What should I tell a clinician?

Describe the colour and texture, when it began, related symptoms, and all medicines, supplements, and recently eaten dark foods.

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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.