Bowel Issues: Causes of Unformed Stool and Color Changes - Gastroenterology and Hepatology

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Bowel issues


Hello doctor, for the past three days, my bowel movements have started as formed stools but then became unformed.
Upon closer observation, I noticed small, flat pieces resembling seaweed (about 1 cm in size) in my stool.
Overall, the color of my stool is a yellowish-brown.
I would like to ask if these flat pieces are caused by indigestion or if they could indicate upper gastrointestinal bleeding.
Additionally, if I ate ice-cold watermelon the night before, could my stool appear pinkish, similar to watermelon flesh, the next day? (It doesn’t look like bright red blood.) Thank you! ^^

Chyu, 10~19 year old female. Ask Date: 2016/07/06

Dr. Lin Minghui reply Gastroenterology and Hepatology


It is possible to experience indigestion, and it may also be due to the consumption of insoluble dietary fiber, which is excreted with the stool.
Certain fruits, such as red dragon fruit and hibiscus, can cause the stool to appear red.
Wishing you good health.

Reply Date: 2016/07/06

More Info


When it comes to bowel issues, particularly in infants and adults, changes in stool color and consistency can be indicative of various health conditions. In your case, the observation of unformed stool with small, seaweed-like pieces and a yellowish-brown color raises several points for consideration.

Firstly, the presence of unformed stool can often be attributed to dietary factors, digestive issues, or gastrointestinal disturbances. In infants, the transition from breast milk to formula can lead to changes in stool consistency and color. For adults, factors such as diet, stress, and gut microbiome alterations can significantly influence bowel habits. For instance, consuming high amounts of fiber or certain foods can lead to softer stools, while a lack of fiber can result in harder, more formed stools.

The small, seaweed-like pieces you described could potentially be undigested food particles, which may suggest a degree of malabsorption or digestive inefficiency. This can occur due to various reasons, including enzyme deficiencies, dietary intolerances (such as lactose intolerance), or even infections. If these pieces are consistent and accompanied by other symptoms such as abdominal pain, bloating, or changes in appetite, it would be prudent to consult a healthcare professional for further evaluation.

Regarding the color of your stool, yellowish-brown is generally considered normal, but it can vary based on diet. For example, consuming foods like watermelon, which you mentioned, can indeed affect stool color. The pinkish hue you observed after eating watermelon is likely due to the natural pigments in the fruit rather than blood. However, if you notice a significant change in color, particularly if it resembles blood (bright red or dark), it is essential to seek medical advice.

In infants, pale or clay-colored stools can indicate a potential issue with bile production or flow, such as biliary atresia or other liver-related conditions. However, in your case, since the infant is otherwise healthy and active, it may not be an immediate concern. Still, it is crucial to monitor for any additional symptoms, such as jaundice (yellowing of the skin or eyes) or dark urine, which would warrant immediate medical attention.

In summary, while changes in stool color and consistency can often be benign and related to dietary factors, they can also indicate underlying health issues. It is essential to observe any accompanying symptoms and consult a healthcare provider if there are concerns about digestive health, especially if changes persist or worsen. Regular monitoring and maintaining a balanced diet, along with adequate hydration, can help support healthy bowel function. If you have ongoing concerns, particularly regarding the presence of blood or significant changes in stool characteristics, do not hesitate to seek professional medical advice.

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