What Does Black Stool Mean and When is It Serious?

Black stool usually indicates upper gastrointestinal bleeding and requires immediate medical attention. When blood from the stomach or upper small intestine mixes with digestive acids, it turns dark black and tarry. This condition, called melena, can result from peptic ulcers, gastritis, or esophageal varices. However, certain foods like blueberries, black licorice, or iron supplements can also cause temporary black discoloration without bleeding. Serious black stool typically has a sticky, tar-like consistency and strong odor. If you experience black stool with symptoms like weakness, dizziness, abdominal pain, or vomiting, seek emergency care immediately as blood loss can be life-threatening.

Related Questions

• What causes blood in stool and when should I worry?

• How can I tell the difference between melena and food-related stool changes?

• What are the symptoms of internal bleeding I should watch for?

• Can medications cause black or dark-colored stool?

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