Rectal Bleeding: Causes, Concerns, and Cancer Risks - Surgery

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Rectal bleeding


I have been experiencing bleeding during bowel movements, and the amount is quite significant! Previously, I only noticed a little blood when wiping after passing a large stool, but this time the bleeding is much more pronounced.
I would like to ask the doctor what might be wrong with me.
My grandfather had colon cancer; is it hereditary?

Xiao Ai, 10~19 year old female. Ask Date: 2005/06/10

Dr. Ke Fangxu reply Surgery


Hello: In response to your question, given your age, the bleeding during bowel movements is likely due to hemorrhoids, so there is no need to be overly concerned.
You should focus on improving your bowel habits (avoiding constipation and not sitting on the toilet for too long), which should help alleviate the bleeding.
Your grandfather is considered a second-degree relative, and according to the definition of hereditary colorectal cancer, there is a higher risk of developing colorectal cancer if there is a first-degree relative under the age of 40 or two or more second-degree relatives.
Additionally, colorectal cancer does not typically occur before the age of 20, and it is quite rare before the age of 40.
If there is a family history, it is recommended to start screening before the age of 35.

Reply Date: 2005/06/10

More Info


Rectal bleeding can be concerning, especially when the amount of blood is significant. It's important to understand that rectal bleeding can arise from various causes, some of which may be benign, while others could indicate a more serious condition, including cancer. Given your family history of colorectal cancer, it is crucial to take your symptoms seriously and seek medical attention.

Common Causes of Rectal Bleeding:
1. Hemorrhoids: These are swollen blood vessels in the rectal area that can cause bleeding, especially during bowel movements. They are often associated with straining, constipation, or prolonged sitting.

2. Anal Fissures: Small tears in the lining of the anus can occur due to passing hard stools, leading to pain and bleeding.

3. Diverticular Disease: This condition involves the formation of small pouches in the colon wall, which can become inflamed or infected, causing bleeding.

4. Colorectal Polyps: These are growths on the lining of the colon or rectum that can bleed. Some polyps can develop into cancer over time.

5. Colorectal Cancer: Given your family history, this is a significant concern. Rectal bleeding can be a symptom of colorectal cancer, especially if accompanied by changes in bowel habits, weight loss, or abdominal pain.

Family History and Genetic Risk:
Having a family history of colorectal cancer, such as your grandfather's diagnosis, can increase your risk. While not all cases of colorectal cancer are hereditary, certain genetic syndromes, like Lynch syndrome or familial adenomatous polyposis (FAP), can significantly elevate the risk of developing colorectal cancer. It is advisable to discuss your family history with your healthcare provider, who may recommend genetic counseling or screening options based on your risk factors.

When to Seek Medical Attention:
You should seek medical attention if:
- The bleeding is significant or persistent.

- You experience additional symptoms such as abdominal pain, changes in bowel habits, or unexplained weight loss.

- You have a family history of colorectal cancer, as early detection is key to successful treatment.

Diagnostic Approach:
Your healthcare provider may recommend several diagnostic tests to determine the cause of your rectal bleeding:
- Physical Examination: A thorough examination, including a digital rectal exam, can provide initial insights.

- Colonoscopy: This procedure allows direct visualization of the colon and rectum, enabling the doctor to identify any abnormalities, such as polyps or tumors, and potentially remove them during the procedure.

- Imaging Studies: In some cases, imaging studies like CT scans may be necessary to assess the colon and surrounding structures.

Conclusion:
In summary, rectal bleeding can have various causes, and while hemorrhoids and anal fissures are common and often benign, your family history of colorectal cancer necessitates a thorough evaluation. It is essential to consult with a healthcare professional promptly to determine the underlying cause of your symptoms and to discuss appropriate screening and management strategies. Early detection and intervention can significantly improve outcomes, especially in cases of colorectal cancer.

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