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

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Blood in the stool?


Hello: Two years ago, I had a very alarming experience where after a bowel movement, the entire toilet was filled with blood, bright red, and it lasted for several days.
Every time I had a bowel movement, there was a lot of blood.
Eventually, it returned to normal.
I have also noticed blood on toilet paper and a slight redness in the toilet bowl.
It seems to occur more often when I am a bit fatigued.
Today, I also noticed blood on the toilet paper and the water in the toilet bowl is slightly pink.
Should I get screened for colorectal cancer?

Wang, 30~39 year old female. Ask Date: 2015/07/14

Dr. Huang Zhihui reply Surgery


If bright red blood is confirmed to be coming from the anus, it is generally indicative of an issue at the anal region, with hemorrhoids (internal hemorrhoids) being the most common cause of bleeding.
However, bleeding from higher up in the gastrointestinal tract, such as tumors, ulcers, inflammation, or angiomata, can also occur.
Although such bleeding typically appears dark red or even black when it exits the anus, small amounts mixed in toilet water can sometimes resemble bright red blood.
Therefore, it is crucial not to take blood in the stool lightly; it is essential to consult a specialist for an examination to determine the source of the bleeding.
The physician may also arrange for procedures such as anoscopy, gastroscopy, or colonoscopy to rule out serious lesions.

Reply Date: 2015/07/14

More Info


When it comes to the presence of blood in your stool, it is understandable to feel concerned, especially given your previous experiences and family history. Blood in the stool can arise from various causes, and while it can be alarming, not all instances indicate a severe condition like colon cancer.

Based on your description, it seems that you have experienced significant bleeding in the past, with your toilet bowl turning completely red. This can be indicative of a few potential issues. The bright red blood typically suggests that the source of the bleeding is closer to the rectum or anus, such as hemorrhoids or anal fissures. These conditions are common and can cause bleeding, especially during bowel movements, particularly if the stool is hard or if you are straining.

However, the fact that you have had episodes of significant bleeding, along with the presence of blood on toilet paper and in the water, warrants further investigation. While hemorrhoids and fissures are common causes, other conditions, including diverticular disease, inflammatory bowel disease (IBD), or even polyps, can also lead to blood in the stool. Given your family history of colon cancer, it is prudent to be more vigilant.

The recommendation to undergo a colonoscopy is a reasonable one, especially considering your symptoms and family history. A colonoscopy allows for direct visualization of the colon and rectum, and it can help identify any abnormalities, such as polyps or tumors, that may not be evident through other tests. Additionally, if any polyps are found during the procedure, they can often be removed at that time, which can help reduce the risk of developing colon cancer in the future.

In terms of your symptoms, it is also essential to consider lifestyle factors that may contribute to your condition. For instance, dietary habits, hydration levels, and bowel habits can all influence the consistency of your stool and the likelihood of straining during bowel movements. Increasing your intake of fiber-rich foods, staying well-hydrated, and ensuring regular bowel habits can help mitigate some of the issues you are experiencing.

Furthermore, if you notice any changes in your bowel habits, such as persistent diarrhea, constipation, or changes in the caliber of your stool, these should also be discussed with your healthcare provider. The presence of abdominal pain, weight loss, or changes in appetite should also prompt further evaluation.

In summary, while the presence of blood in your stool can be concerning, it is essential to approach the situation with a comprehensive understanding. Given your history and symptoms, scheduling a colonoscopy would be a prudent step to rule out any serious conditions, including colon cancer. It is always better to err on the side of caution, especially with a family history of cancer. Your healthcare provider can guide you through the process and help you understand the results, ensuring that you receive the appropriate care and follow-up based on your findings.

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