Narrow Stool: Causes and When to Worry About Colon Cancer - Surgery

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Stool becomes thin?


I would like to ask about my recent bowel movements, which have become thin but without any blood.
I have a history of constipation that has led to hemorrhoids, and I consulted a doctor who prescribed a stool softener.
Recently, my stools have been about the thickness of 1.5 fingers.
Is this due to the stool softener, or could it be a sign of colon cancer? A few days ago, I noticed some slight red specks mixed with my stool, but there was no bleeding from the anus.
After using the restroom, my stools remain thin, but there are no more red specks.
I am still very concerned about the possibility of having colon cancer, especially since I read online that the youngest cases can be as young as 10 years old.

Nìmíng, 20~29 year old female. Ask Date: 2017/07/12

Dr. Yu Mingchang reply Surgery


Hello: Eating more fruits and vegetables is beneficial.
Please take some time to check the colorectal department at Changhua Hospital, Ministry of Health and Welfare, as they care about your health.

Reply Date: 2017/07/12

More Info


Understanding changes in bowel habits, particularly the narrowing of stool, can be concerning, especially when there is a history of constipation and hemorrhoids. Narrow stools can have various causes, and while they can sometimes indicate a serious condition like colon cancer, they are not exclusively linked to it.
In your case, the use of stool softeners may be contributing to the change in stool consistency and shape. Stool softeners work by increasing the water content in the stool, making it easier to pass. This can sometimes lead to softer, narrower stools, especially if the stool is not formed well. Additionally, if you have been experiencing constipation, the stool may have been compacted, and the softer stool may be a result of the treatment you are receiving.

The presence of a slight red color in your stool can also be alarming. However, it is essential to consider the context. If the red color is not accompanied by blood in the toilet bowl or on toilet paper, it could be due to dietary factors, such as consuming foods that can change stool color (like beets) or even from minor irritation in the anal area, especially if you have hemorrhoids.
That said, it is crucial to monitor your symptoms closely. Colon cancer can present with changes in bowel habits, including narrow stools, but it typically comes with other symptoms such as blood in the stool, unexplained weight loss, persistent abdominal discomfort, or changes in bowel habits that last more than a few weeks.
Given your concerns, it is advisable to follow up with your healthcare provider. They may recommend further evaluation, such as a colonoscopy, especially if you have a family history of colorectal cancer or if symptoms persist. Early detection is key in managing any potential issues, including colorectal cancer.

In summary, while narrow stools can be a sign of colon cancer, they can also result from benign causes such as the use of stool softeners or dietary changes. It is essential to keep track of your symptoms and consult with your doctor for a thorough evaluation to rule out any serious conditions. Regular screenings and being aware of changes in your body are vital for maintaining gastrointestinal health.

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