Blood in Stool and Narrowing: Signs of Potential Colon Cancer? - Surgery

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Blood in the stool and a change in stool caliber (becoming thinner) can be concerning symptoms that may indicate underlying gastrointestinal issues. It is important to consult a


Hello Doctor: In recent months, I have been experiencing increasing difficulty with bowel movements.
Occasionally, my stool has some bright red streaks and is very sticky, but the color is golden yellow with some black spots mixed in.
There have been several instances where my stool contained a significant amount of fresh blood, and I sometimes feel like there is also some mucus present.
Since last year, I have noticed some lumps around the anal area, which I believe are hemorrhoids.
However, they have not been painful or bleeding for quite a long time.
Recently, my stool has even become thinner, but my bowel movement frequency remains consistent at once a day.
Could this be colon cancer?

danxin de ren, 20~29 year old female. Ask Date: 2016/02/20

Dr. Yu Mingchang reply Surgery


Hello: Please take some time to visit the colorectal department for an examination.
The Ministry of Health and Welfare Changhua Hospital cares about you.

Reply Date: 2016/02/20

More Info


The presence of blood in the stool, along with changes in bowel habits, can understandably raise concerns about serious conditions such as colon cancer. However, it is essential to consider various factors before jumping to conclusions.

Firstly, the symptoms you describe—difficulty in passing stool, the presence of bright red blood, and changes in the shape of your stool (narrowing)—can be associated with several conditions, not just colon cancer. Hemorrhoids (or piles), which you mentioned having, are a common cause of bright red blood in the stool. They can lead to bleeding, especially during bowel movements, and can also cause discomfort or pain. The fact that you have had hemorrhoids for a long time without significant issues suggests that they may be the source of your bleeding.

The narrowing of your stool can also be attributed to several factors. In many cases, a change in stool shape can indicate a blockage or narrowing in the colon, which may be due to various reasons, including inflammation, strictures, or tumors. However, it is important to note that stool can also become narrower due to changes in diet, hydration, and fiber intake. If your diet lacks sufficient fiber, it can lead to harder stools that are more difficult to pass, which may also contribute to the symptoms you are experiencing.

The presence of black spots in your stool, along with the yellow color, could indicate the presence of undigested food or other dietary factors. However, if the black spots are significant or if you notice a change in the consistency or color of your stool, it is advisable to consult a healthcare professional for further evaluation.

Given your history of hemorrhoids and the recent changes in your bowel habits, it is crucial to seek medical advice. A healthcare provider may recommend a colonoscopy, which is a procedure that allows for direct visualization of the colon and rectum. This examination can help identify any abnormalities, such as polyps, tumors, or other conditions that may be causing your symptoms.

Additionally, while family history can play a role in your risk for colon cancer, it is essential to consider your individual risk factors, including age, lifestyle, and any previous gastrointestinal issues. Since you have experienced changes in your bowel habits and the presence of blood, it is prudent to undergo screening, especially if you have a family history of colorectal cancer.

In summary, while the symptoms you describe could potentially indicate colon cancer, they may also be related to hemorrhoids or other benign conditions. It is essential to consult a healthcare professional for a thorough evaluation and appropriate diagnostic testing. Early detection and intervention are key to managing any potential issues effectively. Remember, it is always better to err on the side of caution when it comes to your health.

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