Post-Surgery Rectal Bleeding: Causes and When to Seek Help - Surgery

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After undergoing surgery for an anal fistula a few years ago, I have recently experienced bleeding. I would like to seek advice?


Hello Dr.
Ke, about 10 years ago I underwent surgery for an anal fistula, but in the past year, I have noticed bleeding occasionally when I experience constipation or diarrhea (especially during multiple episodes).
Is this bleeding from the fistula (the fresh blood sometimes has small clots), or could it indicate an issue with the colon or other organs? How should I handle this or seek medical attention? Thank you.

Mr. Li, 30~39 year old female. Ask Date: 2013/08/20

Dr. Ke Fangxu reply Surgery


Hello: In response to your question, if the fistula surgery was performed ten years ago, the likelihood of recurrence is relatively low.
The most probable cause of bleeding would be hemorrhoids.
It is recommended to develop good dietary habits and a regular lifestyle while avoiding constipation or prolonged straining during bowel movements.
Of course, the risk of malignant tumors is not zero, but it is relatively low considering your age.
If you are still concerned, you may schedule a colonoscopy with a gastroenterologist or proctologist.

Reply Date: 2013/08/20

More Info


Post-surgery rectal bleeding can be concerning, especially when it occurs after a history of anal fistula surgery. Given your situation, it’s essential to understand the potential causes of this bleeding and when to seek medical assistance.

First, it's important to recognize that rectal bleeding can arise from various sources. In your case, since you have a history of anal fistula surgery, the bleeding could potentially be related to that surgical site. Fistula surgery can sometimes lead to complications such as scar tissue formation, which may cause discomfort or bleeding, especially during bowel movements. The presence of fresh blood, particularly if it appears bright red, often indicates that the source of the bleeding is from the lower gastrointestinal tract, such as the rectum or anus.

The fact that you mentioned experiencing bleeding during episodes of constipation or diarrhea is also significant. Straining during bowel movements due to constipation can lead to the rupture of small blood vessels in the anal area, resulting in bright red blood. On the other hand, diarrhea can irritate the anal region, potentially leading to similar bleeding. The presence of small blood clots may suggest that there is some degree of trauma or irritation occurring in the rectal area.

However, it is crucial to consider other potential causes of rectal bleeding that may not be directly related to your previous surgery. Conditions such as hemorrhoids, anal fissures, diverticular disease, or even more serious issues like colorectal polyps or cancer could also be responsible for the bleeding. Given your history and the symptoms you are experiencing, it is advisable to approach this matter with caution.

Here are some steps you can take:
1. Monitor Your Symptoms: Keep track of when the bleeding occurs, the amount of blood, and any accompanying symptoms such as pain, changes in bowel habits, or weight loss. This information will be valuable for your healthcare provider.

2. Dietary Adjustments: To help manage constipation, ensure you are consuming a diet rich in fiber, including fruits, vegetables, and whole grains. Staying hydrated is also essential, as it can help soften stools and reduce straining.

3. Avoid Straining: If you experience constipation, consider using stool softeners or mild laxatives after consulting with your doctor. Avoid straining during bowel movements, as this can exacerbate bleeding.

4. Seek Medical Attention: Given your history of anal fistula surgery and the recurrence of bleeding, it is advisable to consult a healthcare professional. A gastroenterologist or a colorectal surgeon can perform a thorough evaluation, which may include a physical examination and possibly imaging studies or endoscopy to determine the source of the bleeding.

5. Follow-Up Care: If you notice any changes in your symptoms, such as increased bleeding, pain, or changes in bowel habits, seek medical attention promptly. Early intervention can help prevent complications and ensure appropriate management.

In summary, while your rectal bleeding could be related to your previous surgery, it is essential to rule out other potential causes. Monitoring your symptoms, making dietary adjustments, and seeking medical advice are crucial steps in managing your condition. Remember, it is always better to err on the side of caution when it comes to health issues, especially those involving rectal bleeding.

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