Black Stool: Causes and What It Means for Your Health

Q: Black Stool: Causes and What It Means for Your Health

Hello： Black stools resemble tarry feces. <br>If you are unable to distinguish them, a fecal occult blood test can be performed. <br>Changhua Hospital cares about your health. <br>Dr. <br>Tsai An-shun.

Bowel movement color issues?

Dear Doctor: What is the detailed appearance of black stools associated with gastrointestinal bleeding? I often see news reports stating that passing black stools is an important warning sign, but there is no comprehensive description available for reference.
My stool color tends to be darker, sometimes appearing dark brown and close to black, but the color on the toilet paper is relatively normal.
When this occurs, the shape is usually normal and not diarrhea-like.
If I reduce my meat intake or drink more yogurt, the color tends to return to normal.
Is this a cause for concern? Thank you for your guidance.

Niming, 20~29 year old female. Ask Date: 2022/07/19

Dr. Cai Anshun reply Gastroenterology and Hepatology

Hello: Black stools resemble tarry feces.
If you are unable to distinguish them, a fecal occult blood test can be performed.
Changhua Hospital cares about your health.
Dr.
Tsai An-shun.

Reply Date: 2022/07/19

More Info

Black stool can be a concerning symptom that often raises questions about underlying health issues. Understanding the causes and implications of black stool is essential for maintaining good health.
Black stool, or melena, typically indicates the presence of digested blood in the gastrointestinal tract. This can occur due to bleeding from the upper gastrointestinal tract, such as the esophagus, stomach, or the first part of the small intestine. Common causes of upper GI bleeding include peptic ulcers, gastritis, esophageal varices, or even malignancies. The blood, when digested, turns black and gives the stool a tarry appearance.
However, not all black stools are indicative of bleeding. Certain foods and medications can also cause stool to appear black. For instance, consuming large amounts of black licorice, blueberries, or foods with dark coloring can lead to dark stools. Iron supplements and medications containing bismuth (like Pepto-Bismol) can also result in black stools.
In your case, you mentioned that your stool color varies between deep brown and near-black, and that the shape remains normal without diarrhea. This could suggest that your stool is not necessarily indicative of bleeding, especially if you notice a correlation with dietary changes, such as reducing meat intake or increasing yogurt consumption. The color of stool can be influenced by diet, and a high intake of iron-rich foods or supplements can lead to darker stools.
It's important to monitor other symptoms that may accompany black stool. If you experience additional symptoms such as abdominal pain, dizziness, weakness, or if the black stool persists, it is crucial to seek medical attention. A healthcare professional may recommend diagnostic tests, such as a stool test, endoscopy, or imaging studies, to determine the cause of the black stool and rule out any serious conditions.

In summary, while black stool can be a warning sign of gastrointestinal bleeding, it can also result from dietary factors or medications. It is essential to consider the context of your overall health and any accompanying symptoms. If you have concerns about your stool color or any other health issues, consulting with a healthcare provider is the best course of action. They can provide a thorough evaluation and guide you on the necessary steps to take for your health.

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