Stool Color Changes: Causes and Concerns for Patients - Surgery

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Issues with bowel movements?


Hello Doctor, I have internal hemorrhoids and have been applying medication regularly.
I have also had a fecal occult blood test that came back negative.
However, for the past two months, I have noticed that if my stool is soaked in water for more than ten minutes, the water around the stool turns red or orange, while there is no blood on the stool or toilet paper.
Could this be caused by bilirubin or food coloring, or is there a possibility of bleeding? I have also observed that if the stool is not soaked for that long, the water remains colorless.
Thank you for your response.

Niming, 20~29 year old female. Ask Date: 2018/06/18

Dr. Ke Fangxu reply Surgery


The reason feces are brown is due to the presence of bile pigments mixed with food residues.
After being soaked in water for a long time, bile pigments can dissolve, resulting in an orange color, which is not caused by bleeding.
As long as the fecal occult blood test shows a negative result, there is no need for concern.

Reply Date: 2018/06/18

More Info


Understanding stool color changes is crucial for patients, as it can indicate various health conditions. In your case, the observation of red or orange discoloration in the water surrounding your stool after it has been submerged for an extended period raises several considerations.

Firstly, it is essential to understand that stool color can be influenced by a variety of factors, including diet, medications, and underlying health issues. The presence of red or orange coloration in the water could be attributed to several potential causes:
1. Dietary Factors: Certain foods can significantly alter the color of your stool. For instance, foods rich in beta-carotene, such as carrots and sweet potatoes, can lead to orange-colored stools. Similarly, consuming beets can result in a reddish hue. If you have recently increased your intake of such foods, this could explain the color change.

2. Food Dyes: Processed foods often contain artificial colorings that can affect stool color. If you have consumed foods or beverages with strong dyes, this could also be a contributing factor.

3. Bile and Bilirubin: The color of stool is primarily influenced by bile, which is produced by the liver and stored in the gallbladder. Bile is responsible for the brown color of healthy stool. If there is a disruption in bile production or flow, it can lead to changes in stool color. However, since you mentioned that your stool does not appear to have blood, it is less likely that this is a direct cause of your symptoms.

4. Bleeding: While you have indicated that there is no visible blood in your stool or on toilet paper, it is still essential to consider the possibility of gastrointestinal bleeding. Conditions such as hemorrhoids, diverticulosis, or even more serious issues like polyps or tumors can cause bleeding that may not always be visible. The fact that you have internal hemorrhoids could also play a role in this, as they can sometimes lead to minor bleeding.

5. Hydration and Stool Consistency: The way stool interacts with water can also be influenced by its consistency and hydration levels. If your stool is particularly hard or dry, it may not dissolve as readily in water, leading to unusual appearances when submerged.

Given your history of internal hemorrhoids and the negative results from your fecal occult blood test, it is reassuring that there is no evidence of significant bleeding. However, the changes you are observing warrant further investigation. It is advisable to consult with a healthcare professional, preferably a gastroenterologist, who can perform a thorough evaluation. This may include a physical examination, a review of your dietary habits, and possibly imaging studies or endoscopy to rule out any underlying conditions.

In summary, while the changes in stool color you are experiencing may be benign and related to dietary factors, it is essential to remain vigilant. Monitoring any additional symptoms, such as changes in bowel habits, abdominal pain, or weight loss, is crucial. If you notice any concerning signs, do not hesitate to seek medical attention. Regular check-ups and open communication with your healthcare provider can help ensure that any potential issues are addressed promptly.

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