Black Spots in Stool: When to See a Doctor - Surgery

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Stool with a few black spots and black particles?


Hello Doctor, I have recently noticed occasional small black spots or specks in my stool.
I would like to know if it is necessary to see a doctor about this.
I have been mindful of my diet, but sometimes it lasts for two or three consecutive days, so I'm unsure if it's diet-related or if there is an issue with my body.
I read online that if this condition persists for several days, it is advisable to see a doctor, but often it disappears after a couple of days and then reappears after a few days.
Thank you, Doctor.

Wei, 20~29 year old female. Ask Date: 2020/10/01

Dr. Ke Fangxu reply Surgery


Abnormal stool color is often caused by food residues, with common culprits including carrots, dragon fruit, tomatoes, and pumpkin.
Fruit seeds may also contribute to this issue.
It is advisable to temporarily avoid dark-colored foods.
If the color does not improve, a physician may recommend a colonoscopy for further evaluation.

Reply Date: 2020/10/01

More Info


When it comes to noticing black spots or black particles in your stool, it is essential to approach the situation with caution and awareness. While occasional changes in stool color can be attributed to dietary factors, the presence of black spots can sometimes indicate underlying health issues that may require medical attention.

Firstly, it is important to understand what black spots in stool might signify. The color of stool can be influenced by various factors, including the foods you consume, medications, and the presence of blood. Black stools, particularly if they are tarry or have a foul odor, can indicate the presence of digested blood, which may originate from the upper gastrointestinal tract, such as the stomach or esophagus. This condition is known as melena and can be a sign of bleeding that requires immediate medical evaluation.

On the other hand, if the black spots are small and not accompanied by other symptoms such as abdominal pain, changes in bowel habits, or weight loss, they may be related to dietary choices. Foods such as black licorice, blueberries, or iron supplements can sometimes cause dark specks in the stool. Additionally, certain medications, particularly those containing bismuth (like Pepto-Bismol), can also lead to darkening of the stool.

Given that you have observed these black spots intermittently over a few days, it is crucial to monitor any accompanying symptoms. If you experience any of the following, it is advisable to seek medical attention promptly:
1. Persistent Black Spots: If the black spots continue to appear over several days without resolution, it would be wise to consult a healthcare provider.


2. Accompanying Symptoms: If you experience symptoms such as abdominal pain, cramping, diarrhea, constipation, nausea, vomiting, or any signs of gastrointestinal bleeding (like bright red blood in stool or black, tarry stools), you should see a doctor immediately.

3. Changes in Bowel Habits: Any significant changes in your bowel habits, such as increased frequency or consistency changes, should be discussed with a healthcare professional.

4. Weight Loss or Fatigue: Unexplained weight loss or persistent fatigue can be signs of a more serious condition and warrant further investigation.

In conclusion, while occasional black spots in stool may not always indicate a serious problem, it is essential to remain vigilant. If the black spots persist, change in nature, or are accompanied by other concerning symptoms, it is advisable to consult with a healthcare provider. They may recommend diagnostic tests, such as a stool analysis or endoscopy, to determine the underlying cause and ensure appropriate treatment. Remember, it is always better to err on the side of caution when it comes to your health.

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