Is Your Stool Black? Gastrointestinal Health Concerns - Gastroenterology and Hepatology

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Is it blood in the stool?


Hello Doctor, I visited the hospital in March this year due to issues with diarrhea upon waking up.
The doctor did not conduct any tests and diagnosed it as irritable bowel syndrome.
After taking medication, my bowel movements returned to normal, but sometimes when my stool is soft, I notice that it appears dark or has small black specks.
(Attached is an image).
I would like to ask if this is normal?

Huang, 10~19 year old female. Ask Date: 2020/05/03

Dr. Chen Shidian reply Gastroenterology and Hepatology


A fecal occult blood test can be performed for confirmation.

Reply Date: 2020/05/03

More Info


When it comes to gastrointestinal health, the color and consistency of your stool can provide important clues about your digestive system's condition. Black stools, particularly those that resemble tar or have a very dark color, can be indicative of gastrointestinal bleeding, which is a serious concern. This can occur due to various conditions, including peptic ulcers, gastritis, or even malignancies in the gastrointestinal tract.
In your case, you mentioned experiencing episodes of diarrhea, abdominal pain, and the presence of black stools or dark spots in your stool. Given your history of gastrointestinal issues, including a previous diagnosis of irritable bowel syndrome (IBS), it is crucial to take these symptoms seriously. While IBS can cause a range of symptoms, including changes in bowel habits and abdominal discomfort, the presence of black stools should not be overlooked.

The black color of your stool could be due to several factors. One possibility is the consumption of certain foods or supplements that can darken stool color, such as black licorice, blueberries, or iron supplements. However, if the stool is consistently black and has a tar-like appearance, it is more likely to be a sign of bleeding in the upper gastrointestinal tract. This is because blood that is digested and processed by the intestines can turn black as it moves through the digestive system.

You also mentioned that you have experienced soft stools and occasional black spots. If these spots are small and not consistent with the overall color of the stool, they may not be a cause for concern. However, if the black color persists or if you experience other symptoms such as dizziness, weakness, or significant changes in your bowel habits, it is essential to seek medical attention promptly.

In terms of management, it is advisable to consult with a healthcare professional who can perform a thorough evaluation. This may include a physical examination, a review of your medical history, and possibly diagnostic tests such as blood tests, stool tests, or imaging studies to determine the underlying cause of your symptoms. If gastrointestinal bleeding is suspected, an endoscopy may be necessary to visualize the upper gastrointestinal tract and identify any sources of bleeding.

Regarding the medications you were prescribed, it is important to follow your doctor's instructions. If you have been advised to take medications only when symptoms arise, it is crucial to monitor your condition closely. If you notice any worsening of symptoms or new symptoms developing, do not hesitate to contact your healthcare provider for further guidance.

In summary, while some changes in stool color can be attributed to dietary factors, the presence of black stools, especially if they are tarry or accompanied by other concerning symptoms, warrants further investigation. It is always better to err on the side of caution when it comes to gastrointestinal health, so please consult with your healthcare provider to ensure that any potential issues are addressed appropriately.

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