Stool Color Changes: When to Worry About Black Spots - Gastroenterology and Hepatology

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Bowel-related issues?


Hello doctor, I have recently started to pay special attention to the characteristics of my stool during bowel movements.
I noticed that my stool is yellow, but for a continuous period, there have been black spots in it.
Some are long, black streaks, while others are clumped black pieces mixed in with the yellow stool.
I am very concerned that it might be colon cancer.
I am unsure if the term "melena" refers to stool that is entirely black or if having any black coloration counts.
Should I go to a major hospital for a fecal occult blood test, or are there specific symptoms I should be particularly aware of? Thank you for your response, doctor.

A-Kai, 20~29 year old female. Ask Date: 2021/06/27

Dr. Cai Jinji reply Gastroenterology and Hepatology


Hello Mr.
A-Kai: In general medical terms, black stools refer to feces that have a tarry appearance.
If you are truly concerned, it is advisable to take a picture first and then visit a hospital to consult a physician.
Director Cai Jin-ji, Department of Hepatobiliary and Gastroenterology, Nantou Hospital.

Reply Date: 2021/06/27

More Info


When it comes to changes in stool color, particularly the presence of black spots or black streaks in your stool, it is important to understand the potential implications and when to seek medical attention. The color and consistency of stool can be influenced by a variety of factors, including diet, medications, and underlying health conditions.

Black stool, or melena, typically indicates the presence of blood that has been digested, which can occur when there is bleeding in the upper gastrointestinal tract, such as from the stomach or the first part of the small intestine. However, not all black stool is a cause for alarm. Certain foods, supplements, and medications can also lead to dark-colored stools. For instance, consuming foods like black licorice, blueberries, or beets can result in darker stool. Additionally, iron supplements and certain medications like Pepto-Bismol can also cause blackening of the stool.

In your case, you mentioned observing black spots or streaks mixed in with yellow stool. This could be due to several benign reasons, such as dietary factors or the presence of undigested food particles. However, if the black spots are consistent and you notice other concerning symptoms, it is crucial to take them seriously.

Here are some symptoms that warrant immediate medical attention:
1. Persistent Black Stools: If the black spots or streaks persist over several days, it is advisable to consult a healthcare provider.


2. Accompanying Symptoms: If you experience additional symptoms such as abdominal pain, cramping, nausea, vomiting (especially if the vomit looks like coffee grounds), or significant changes in bowel habits, these could indicate a more serious condition.

3. Weight Loss: Unexplained weight loss can be a sign of various health issues, including gastrointestinal problems.

4. Fatigue or Weakness: If you feel unusually fatigued or weak, it could be a sign of anemia, which can occur with chronic bleeding.

5. Changes in Appetite: A sudden change in appetite, particularly if accompanied by other symptoms, should be evaluated.

Given your concerns about colorectal cancer, it is understandable to feel anxious. While the presence of black spots in stool can be alarming, it is essential to remember that many factors can contribute to changes in stool color. If you are particularly worried about the possibility of colorectal cancer, it is advisable to discuss your symptoms with a healthcare provider who may recommend a stool test for occult blood or other diagnostic procedures, such as a colonoscopy, depending on your age, family history, and risk factors.

In summary, while occasional changes in stool color can be benign, it is essential to monitor your symptoms closely. If you notice persistent changes or any concerning symptoms, do not hesitate to seek medical advice. Early detection and intervention are key in managing any potential health issues effectively.

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