Blood in Stool: Is It a Sign of Colon Cancer? - Surgery

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Stool mixed with blood?


Hello, doctor.
I usually experience constipation, having a bowel movement every 3-4 days, and the stools are typically hard and pellet-like.
I have had internal hemorrhoids for a long time, and my bowel habits have not changed significantly.
However, I recently noticed that a small portion of my stool is mixed with dark red blood or pinkish tissue-like material.
It seems to be on the surface of the stool rather than fresh blood that is flowing out.
There is no bleeding or pain when wiping.
Since I started noticing this, I have felt a dull sensation in my lower left abdomen, which I am unsure if it is due to psychological factors.
I would like to ask the doctor if this condition could possibly be colon cancer.
Thank you.

Y, 20~29 year old female. Ask Date: 2023/01/12

Dr. Ke Fangxu reply Surgery


The likelihood of developing colorectal cancer at the age of 26 is not zero, but generally, it is very low.
Based on your description, it seems more like hemorrhoidal bleeding.
It is recommended to start with a light diet and maintain a good lifestyle.
Spicy, irritating, and greasy foods should be avoided.
Increasing dietary fiber intake can also be beneficial.
If symptoms persist without improvement, you may consult a physician for medication or consider undergoing a colonoscopy.

Reply Date: 2023/01/12

More Info


When it comes to the presence of blood in stool, it is understandable to be concerned about the possibility of colon cancer, especially given your history of constipation and hemorrhoids. However, it is essential to consider various factors before jumping to conclusions.

Firstly, the appearance of blood in the stool can be attributed to several causes, and not all of them are indicative of cancer. In your case, the blood you describe as being mixed with the stool could be related to your existing hemorrhoids. Hemorrhoids can cause bleeding, especially when straining during bowel movements, which is common in individuals who experience constipation. The fact that you do not experience pain or fresh blood upon wiping further suggests that the bleeding may not be severe or indicative of a more serious condition.

The color of the blood is also significant. Bright red blood typically indicates bleeding from the lower gastrointestinal tract, such as the rectum or anus, while darker blood may suggest bleeding from higher up in the digestive tract. In your case, the dark red or pinkish hue mixed with the stool could be a sign of minor bleeding from hemorrhoids or even small fissures in the anal area, rather than a sign of colon cancer.

Regarding your concerns about colon cancer, it is important to note that while blood in the stool can be a symptom of colon cancer, it is not the only symptom, nor is it definitive on its own. Other symptoms of colon cancer may include changes in bowel habits, unexplained weight loss, persistent abdominal discomfort, or a feeling that your bowel does not empty completely. Since you mentioned that you have not experienced significant changes in your bowel habits aside from the presence of blood, this may reduce the likelihood of cancer.

Moreover, your left lower abdominal discomfort could be related to your bowel habits or even anxiety about the situation. Psychological factors can often exacerbate physical sensations, leading to a heightened awareness of discomfort that may not be directly related to a medical condition.

Given your history of constipation and hemorrhoids, it is advisable to maintain a healthy diet rich in fiber, stay hydrated, and consider regular physical activity to promote better bowel health. Incorporating more fruits, vegetables, and whole grains can help soften stools and reduce the strain during bowel movements, potentially alleviating the bleeding associated with hemorrhoids.

However, it is crucial to consult with a healthcare professional for a thorough evaluation. A colonoscopy may be recommended to rule out any serious conditions, especially considering your family history of colon cancer. Regular screenings are essential, particularly if there is a family history of colorectal cancer, as they can help detect any abnormalities early on.

In summary, while the presence of blood in your stool is concerning, it is not automatically indicative of colon cancer, especially in the context of your existing conditions. Monitoring your symptoms, maintaining a healthy lifestyle, and seeking medical advice for further evaluation will provide you with the best course of action. Remember, early detection and intervention are key in managing any potential health issues.

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