Flat Stool: Causes and Concerns in Gastroenterology - Gastroenterology and Hepatology

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Bowel issues


Hello Dr.
Chen, I have recently noticed that my stools have a flat shape.
There is no bleeding and no other symptoms.
What could be the cause?

Le En, 30~39 year old female. Ask Date: 2020/11/03

Dr. Chen Shidian reply Gastroenterology and Hepatology


It is recommended to increase the intake of fruits and vegetables (fiber) and then monitor the situation.

Reply Date: 2020/11/03

More Info


Flat stools, or stools that appear flattened or ribbon-like, can be a cause for concern and warrant further investigation, especially when they are a new development in your bowel habits. While you mentioned that you have not experienced any bleeding or other symptoms, the change in stool shape can still indicate underlying gastrointestinal issues that should be addressed.

One of the primary concerns with flat stools is the possibility of an obstruction in the colon. This obstruction can be caused by various factors, including polyps, tumors, or strictures (narrowing of the bowel). When the stool passes through a narrowed area, it can take on a flattened appearance. Although you have not reported any accompanying symptoms such as abdominal pain, changes in appetite, or weight loss, it is essential to consider that some conditions may not present with overt symptoms until they progress.

Another potential cause of flat stools is a condition known as irritable bowel syndrome (IBS), which can lead to changes in stool consistency and shape. IBS is a functional gastrointestinal disorder characterized by symptoms such as abdominal pain, bloating, and altered bowel habits, including diarrhea and constipation. However, IBS typically presents with a range of symptoms, and if flat stools are your only concern, it may not be the primary diagnosis.

In some cases, dietary factors can also influence stool shape. A diet low in fiber can lead to harder, more compact stools, while a diet high in fiber can promote regular bowel movements and a more typical stool shape. If there have been recent changes in your diet, it may be worth considering whether this could be contributing to the change in stool appearance.

Given your situation, it is advisable to consult with a gastroenterologist for a thorough evaluation. They may recommend diagnostic tests such as a colonoscopy or imaging studies to rule out any significant underlying conditions. A colonoscopy can help visualize the interior of the colon and identify any abnormalities such as polyps or tumors. Additionally, stool tests may be conducted to check for any signs of infection or inflammation.

In summary, while flat stools can sometimes be benign, they can also indicate underlying gastrointestinal issues that require attention. It is essential to monitor any changes in your bowel habits and seek medical advice if the flat stools persist or if you develop any new symptoms. Early intervention can help address potential issues before they become more serious. Remember, maintaining a balanced diet rich in fiber, staying hydrated, and managing stress can also contribute to overall digestive health.

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