Blood in Stool: Should You Worry About Colon Cancer? - Surgery

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Blood in the stool?


Hello Dr.
Hsu: Last week, I noticed fresh blood on the toilet paper after having a bowel movement.
The stool in the toilet appeared normal in shape, but there was no blood in it.
On February 18, my bowel movement was slightly hard, and again I saw fresh blood on the toilet paper (similar to a skin tear).
This time, there was blood in the stool (not at the end).
I had a colonoscopy last year, and the doctor mentioned that I have internal hemorrhoids.
I would like to ask if I need to undergo another colonoscopy for clarification.
Does the presence of blood in the stool indicate a possibility of colorectal cancer? Thank you.

Xiao Hua, 40~49 year old female. Ask Date: 2019/02/18

Dr. Xu Kaixi reply Surgery


If you underwent a colonoscopy last year and were diagnosed with internal hemorrhoids, the likelihood of developing colorectal cancer in a short period is low.
The cause of the bleeding is likely still related to the internal hemorrhoids, and a repeat colonoscopy is not recommended.

Reply Date: 2019/02/18

More Info


When it comes to the presence of blood in stool, it can understandably cause concern, especially given your previous history of internal hemorrhoids and the fact that you had a family member with colon cancer. However, it's important to approach this situation with a clear understanding of the potential causes and the appropriate steps to take.

Firstly, the presence of bright red blood on toilet paper or mixed with stool can be indicative of several conditions, most commonly hemorrhoids, anal fissures, or diverticular disease. Given that you have a known history of internal hemorrhoids, it is quite possible that the blood you are observing is related to this condition. Hemorrhoids can bleed, especially when there is straining during bowel movements or if the stool is hard. The fact that you mentioned your stool was slightly hard on the day you noticed blood could further support this possibility.

Colon cancer is a serious concern, particularly if there is a family history of the disease. However, it is essential to note that the symptoms of colon cancer often include changes in bowel habits, unexplained weight loss, persistent abdominal discomfort, and blood in the stool that is often darker or mixed throughout the stool rather than just on the surface. Your description of the blood being bright red and primarily on the toilet paper suggests that it is more likely from a source closer to the anus, such as hemorrhoids or a fissure, rather than from higher up in the colon.

Since you had a colonoscopy last year, and if there were no significant findings at that time, the risk of having developed colon cancer in such a short time frame is relatively low, especially if you are under the age of 50 and have no other risk factors. The recommendation for colonoscopy screening generally follows guidelines based on age and risk factors, and for most individuals, a colonoscopy is recommended every 10 years if no abnormalities are found.

However, given your current symptoms, it is advisable to consult with your healthcare provider. They may recommend a few steps:
1. Observation: If the bleeding is infrequent and you are not experiencing any other concerning symptoms (like significant pain, weight loss, or changes in bowel habits), you may be advised to monitor the situation for a short period.

2. Dietary Adjustments: Increasing fiber intake and staying hydrated can help soften stool and reduce straining during bowel movements, which may alleviate symptoms related to hemorrhoids.

3. Follow-Up Colonoscopy: If the bleeding persists or worsens, or if you develop new symptoms, your doctor may recommend a follow-up colonoscopy to rule out any other potential issues.

4. Other Diagnostic Tests: Depending on your symptoms, your doctor might suggest additional tests, such as a flexible sigmoidoscopy or a rectal examination, to assess the source of the bleeding.

In conclusion, while the presence of blood in your stool can be alarming, it is not always indicative of colon cancer, especially in the context of known hemorrhoids. It is crucial to maintain open communication with your healthcare provider, who can guide you through the appropriate steps based on your specific situation. Regular screenings and being attentive to changes in your body are key components of maintaining gastrointestinal health.

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