Changes in Stool: Is It a Sign of Rectal Cancer? - Gastroenterology and Hepatology

Q: Changes in Stool: Is It a Sign of Rectal Cancer?

Hello： Stool consistency is a nonspecific symptom of colorectal cancer and does not necessarily indicate a relationship with the disease. <br>It is often more related to the types of food consumed or the amount of water intake. <br>Changhua Hospital cares about your health. <br>D

Fecal-related issues?

Hello Doctor, I would like to inquire about the issue of stool narrowing caused by rectal cancer.
I came across an article that mentioned that alternating between thick and thin stools could indicate the presence of a tumor in the intestines, which made me a bit anxious.
If stool narrowing is caused by rectal cancer, it should be a continuous narrowing that progressively becomes thinner, rather than alternating between thick and thin, correct? My usual stool is thick, and it only becomes thinner and softer when I consume fewer fruits and vegetables and more refined starches, or occasionally when I have two bowel movements in one day, which is normal, right? Here are the images of my usual stool: [link].
And here is the image when I consume fewer fruits and vegetables: [link].
I do not have a family history of this condition, and after reading the article, I became concerned and did a stool occult blood test, which came back normal.
I do not have any bad habits, nor do I experience blood in my stool, abdominal pain, or significant weight loss.
However, I am still a bit worried after reading that article.
Could you please help me with this so I don't have to worry excessively? Thank you, Doctor.
🙏

Chu, 20~29 year old female. Ask Date: 2022/01/10

Dr. Cai Anshun reply Gastroenterology and Hepatology

Hello: Stool consistency is a nonspecific symptom of colorectal cancer and does not necessarily indicate a relationship with the disease.
It is often more related to the types of food consumed or the amount of water intake.
Changhua Hospital cares about your health.
Dr.
Tsai An-Shun.

Reply Date: 2022/01/10

More Info

Understanding changes in stool can indeed be concerning, especially when it comes to potential signs of rectal cancer. The article you referenced suggests that variations in stool thickness—specifically, a change to thinner stools—can be indicative of a possible tumor in the gastrointestinal tract. However, it is essential to understand the nuances of this symptom and its implications.

When it comes to rectal cancer, the change in stool consistency or shape is typically associated with a more persistent alteration rather than intermittent changes. If rectal cancer is present, patients often report a consistent change in their bowel habits, such as stools becoming thinner over time. This is due to the tumor potentially obstructing the passage of stool, leading to a narrowing of the stool's diameter. Therefore, if you are experiencing stools that are occasionally thinner but predominantly normal, it is less likely to be a direct sign of rectal cancer.

Your observation that your stools are generally normal but can become thinner when your diet lacks fiber is quite common. Diet plays a significant role in stool consistency. A diet high in refined carbohydrates and low in fruits and vegetables can lead to softer, less formed stools. Conversely, a diet rich in fiber typically results in firmer, bulkier stools. It is also normal for stool consistency to vary from day to day based on dietary intake, hydration levels, and other factors.

Regarding your concerns about family history and other symptoms, it is reassuring that you do not have a family history of colorectal cancer, and your stool occult blood test came back normal. The absence of alarming symptoms such as blood in the stool, significant weight loss, or abdominal pain further reduces the likelihood of a serious underlying condition.
It is crucial to maintain regular health check-ups, especially if you have any concerns about your gastrointestinal health. If you notice any persistent changes in your bowel habits or if you develop new symptoms, it would be wise to consult with a healthcare professional for further evaluation.
In summary, while changes in stool can be a sign of rectal cancer, the context in which these changes occur is vital. Intermittent changes in stool thickness, especially related to dietary habits, are generally not a cause for alarm. However, maintaining a balanced diet rich in fiber, staying hydrated, and being vigilant about any new or persistent symptoms is essential for overall gastrointestinal health. If you continue to feel anxious about your symptoms, consider discussing your concerns with a healthcare provider who can offer personalized advice and reassurance.

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