Changes in Stool Shape: When to Worry? - Gastroenterology and Hepatology

Bowel movement issues

I had a fecal occult blood test done last month, and the results were normal.
I would like to inquire about my recent bowel movements.
The color and consistency of the stool have been normal, and there is no blood.
However, the last one centimeter of the stool tapers to a pencil-like thinness.
Could this be due to the stool being compressed and deformed as it passes through the anal sphincter?

Danny, 20~29 year old female. Ask Date: 2021/12/30

Dr. Chen Shidian reply Gastroenterology and Hepatology

You can increase your intake of fruits and vegetables and monitor the situation.

Reply Date: 2021/12/30

More Info

When it comes to changes in stool shape, particularly when you notice that the end of your stool appears pencil-thin, it can understandably cause concern. While you mentioned that your recent stool tests for occult blood were normal and that the majority of your stool appears normal in color and consistency, the change in shape warrants a closer look.

Firstly, it is important to understand that stool shape can be influenced by various factors, including diet, hydration, and the overall health of your gastrointestinal tract. A pencil-thin stool can sometimes be a result of the stool being compressed as it passes through the anal canal, particularly if there is any tension or straining during bowel movements. This can happen if the stool is particularly hard or if there is a temporary narrowing of the anal canal due to muscle tension.

However, a persistent change in stool shape, especially if it is consistently thin, can be a sign of an underlying issue that may require further evaluation. One of the more serious concerns associated with pencil-thin stools is the possibility of an obstruction or narrowing in the colon, which can be caused by conditions such as colorectal cancer or benign growths like polyps. These conditions can lead to changes in bowel habits and stool characteristics.

Given that you have had a recent stool test that was normal, it is reassuring, but it does not completely rule out the need for further investigation. If the change in stool shape persists, or if you experience any additional symptoms such as abdominal pain, changes in bowel habits (like diarrhea or constipation), unexplained weight loss, or blood in your stool, it is crucial to seek medical attention. A healthcare provider may recommend further diagnostic tests, such as a colonoscopy, to visualize the inside of your colon and rule out any serious conditions.

In summary, while a temporary change in stool shape can be benign and related to factors like diet or temporary compression, persistent changes should not be ignored. It is always better to err on the side of caution and consult with a healthcare professional if you have concerns about your bowel health. They can provide personalized advice and determine if any further testing is necessary to ensure your gastrointestinal health is maintained.

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