Black Spots in Stool: Causes and Concerns - Gastroenterology and Hepatology

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Black specks in stool?


Hello doctor, I used to have bowel movements every 2 to 3 days, but recently I have been having them daily.
My stools are shaped like logs but tend to be wet and sticky.
Over the past couple of days, I have noticed many black spots on them; I'm not sure if they are spots or holes.
I also notice that there is a lot of yellow when I wipe.
My stomach doesn't hurt, and I would like to know what the cause might be.
Thank you.

Huang, 10~19 year old female. Ask Date: 2020/12/09

Dr. Cai Jinji reply Gastroenterology and Hepatology


Hello Ms.
Huang: Most of the issues are related to diet.
Please continue to observe your condition.
If there is no improvement after some time, it is advisable to consult a physician and undergo an examination.
Director Cai JinjI, Department of Hepatobiliary and Gastroenterology, Nantou Hospital.

Reply Date: 2020/12/09

More Info


Black spots in stool can be concerning and may indicate various underlying issues. It's important to understand the potential causes and when to seek medical attention.
Firstly, the appearance of black spots in stool can be attributed to several factors. One common cause is the ingestion of certain foods or medications. For instance, foods that are dark in color, such as blackberries, blueberries, or foods with dark coloring, can lead to black specks in the stool. Additionally, iron supplements or medications containing bismuth (like Pepto-Bismol) can also cause darkening of the stool.

Another significant cause of black spots in stool is gastrointestinal bleeding. When there is bleeding in the upper gastrointestinal tract, such as from the stomach or duodenum, the blood can oxidize and turn black as it passes through the intestines. This condition is known as melena and can be a sign of serious issues such as ulcers, gastritis, or even tumors. If the black spots are accompanied by other symptoms such as abdominal pain, vomiting blood, or significant changes in bowel habits, it is crucial to seek medical attention promptly.

In your case, you mentioned that your stool is "wet and sticky" and that you have been experiencing these black spots for the past few days without any abdominal pain. While the absence of pain is a positive sign, it does not rule out the possibility of gastrointestinal bleeding or other conditions. The yellow color of the stool after wiping could indicate the presence of bile, which is normal, but it’s essential to monitor any changes in your bowel habits or stool characteristics.

To address your concerns, I recommend the following steps:
1. Dietary Review: Consider any recent changes in your diet. Have you consumed any dark-colored foods or supplements that could explain the black spots? Keeping a food diary may help identify any correlations.

2. Hydration: Ensure you are well-hydrated, as dehydration can lead to changes in stool consistency. Drinking plenty of water can help maintain normal bowel function.

3. Monitor Symptoms: Keep an eye on any additional symptoms that may arise, such as changes in appetite, weight loss, or any discomfort. If you notice any concerning symptoms, it is essential to consult a healthcare provider.

4. Medical Consultation: Given that you have noticed these changes recently, it would be prudent to consult a healthcare professional. They may recommend tests such as a stool analysis, blood tests, or imaging studies to determine the cause of the black spots.

5. Avoid Self-Diagnosis: While it is tempting to search for answers online, self-diagnosis can lead to unnecessary anxiety. A healthcare provider can offer a proper diagnosis and treatment plan based on a thorough examination.

In conclusion, while black spots in stool can be benign, they can also indicate more serious conditions. It is essential to approach this symptom with caution and seek medical advice to rule out any potential issues. Early intervention can lead to better outcomes, especially if there is an underlying condition that requires treatment.

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