Is Blood and Mucus in Stool a Sign of Colon Cancer? - Gastroenterology and Hepatology

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Is blood and mucus in the stool a sign of colon cancer?


Starting from around March 10th, I have been experiencing blood and mucus in my stool every day.
Sometimes, when I try to use the toilet, I am unable to pass anything except for some blood and mucus, along with what seems to be non-fecal matter.
I have a regular exercise routine, drink plenty of water, and consume a high-fiber diet.
I am concerned whether I might have colon cancer.

Yì, 30~39 year old female. Ask Date: 2018/03/29

Dr. Chen Shidian reply Gastroenterology and Hepatology


Hello, you may need to visit the Gastroenterology and Hepatology outpatient clinic for a detailed examination.
The Ministry of Health and Welfare Changhua Hospital is concerned about your health.

Reply Date: 2018/03/29

More Info


The presence of blood and mucus in the stool can indeed be concerning, and while it may be a sign of various gastrointestinal issues, it is important to approach this symptom with a comprehensive understanding of potential causes, including the possibility of colon cancer.

Firstly, blood in the stool can manifest in different forms. Bright red blood typically indicates bleeding from the lower gastrointestinal tract, such as the rectum or colon, while darker blood may suggest bleeding from higher up in the gastrointestinal tract. Mucus in the stool can be a normal finding, as the intestines produce mucus to help with the passage of stool. However, an increase in mucus production, especially when accompanied by blood, can indicate inflammation or irritation in the intestines.

Given your symptoms of daily blood and mucus in the stool, along with difficulty passing stool, it is crucial to consider several potential causes:
1. Hemorrhoids: These are swollen veins in the rectum or anus that can cause bright red blood in the stool or on toilet paper. They are often associated with straining during bowel movements.

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

3. Inflammatory Bowel Disease (IBD): Conditions such as Crohn's disease or ulcerative colitis can cause inflammation in the intestines, leading to symptoms like blood and mucus in the stool, abdominal pain, and changes in bowel habits.

4. Infections: Bacterial, viral, or parasitic infections can lead to gastrointestinal symptoms, including diarrhea with blood and mucus.

5. Polyps or Colorectal Cancer: While less common, the presence of blood and mucus can be a sign of colorectal cancer or polyps, especially if there is a family history of colorectal cancer or if you are over the age of 50.

In your case, since you have been experiencing these symptoms consistently since early March, it is essential to seek medical evaluation. A healthcare provider may recommend a colonoscopy, which is a procedure that allows direct visualization of the colon and rectum. This can help identify any abnormalities, such as polyps, inflammation, or tumors, and allow for biopsy if necessary.

Additionally, given your active lifestyle and dietary habits, it is important to ensure that you are consuming enough fiber and staying hydrated, as these factors can influence bowel health. However, if you are experiencing significant changes in your bowel habits, such as increased frequency of blood and mucus, it is crucial not to dismiss these symptoms as benign.

In summary, while blood and mucus in the stool can be caused by a variety of conditions, including hemorrhoids and infections, they can also be indicative of more serious issues such as inflammatory bowel disease or colorectal cancer. Given your symptoms, it is advisable to consult with a healthcare professional for a thorough evaluation and appropriate diagnostic testing. Early detection and intervention are key in managing any potential gastrointestinal issues effectively.

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