Yellowish Mucus in Stool: Is It a Sign of Colon Issues?

Fecal occult blood is normal (negative), but each time there is yellowish-white thick mucus present?

Hello, Doctor! I am 28 years old, and about a month and a half ago, I started feeling a persistent swelling and burning sensation in my anus, even when I am not having a bowel movement, similar to the feeling after straining to pass a stool.
However, this swelling does not go away on its own.
My bowel habits are normal, and I do not have diarrhea or significant abdominal pain.
However, I usually exercise little and do not eat enough fiber, so this situation prompted me to increase my intake of fruits and vegetables and closely monitor the appearance of my stool (including taking photos for records).

After a few weeks of observation, I found that although the color and shape (size) of my stool appear healthy and there is no visible blood, I noticed that each stool is coated with a layer of yellowish-white mucus, or there is mucus mixed at both ends of the stool, which was not common a month and a half ago.
I asked my family to examine the appearance of my anus, and they did not find any abnormalities (such as fistulas or pimples).
Last night, I collected a stool sample for a fecal occult blood test, and the result was negative.
However, upon closer inspection of the stool, I realized how severe the mucus situation is; golden/white mucus can be found on each piece of separated stool, thick and sticky like the texture of nasal mucus, and the amount is quite alarming (please see the stool photos at https://imgur.com/a/z2sSiln).

Could this possibly be an early stage of colon cancer? I wonder if colon cancer, even in its early stages, does not necessarily cause blood in the stool? Or is it, as I read in articles online, just inflammation in some part of the colon (Irritable Bowel Syndrome) or intestinal hyperactivity? If it is just inflammation, can medication help improve the condition? I feel like I have read about all gastrointestinal-related diseases, but I cannot find any that match my current symptoms (swelling sensation in the anus/thick mucus).
What do you think, and what would you recommend I do? Could a preliminary digital rectal examination provide me with answers? Thank you, Doctor, for your response!

Claire, 20~29 year old female. Ask Date: 2020/01/15

Dr. Chen Shidian reply Gastroenterology and Hepatology

The colon naturally secretes mucus, so as long as the occult blood test is negative and there are no discomforting symptoms, there is no need for excessive concern.

Reply Date: 2020/01/15

More Info

The symptoms you are experiencing, particularly the presence of yellowish mucus in your stool and the persistent feeling of swelling and burning around the anus, can be concerning and warrant further investigation. While I cannot provide a definitive diagnosis without a physical examination, I can offer some insights based on your description and common medical knowledge.

1. Understanding Mucus in Stool: The presence of mucus in stool can be a normal occurrence, as mucus is produced by the intestines to help lubricate the passage of stool. However, an increase in the amount or a change in the characteristics of the mucus can indicate underlying issues. In your case, the yellowish, thick, and abundant mucus could suggest inflammation in the intestines, which is often associated with conditions like Irritable Bowel Syndrome (IBS) or other inflammatory bowel diseases (IBD) such as Crohn's disease or ulcerative colitis.

2. Potential Causes: The symptoms you describe, including the persistent feeling of swelling and burning around the anus, could be related to several conditions:
- Irritable Bowel Syndrome (IBS): This functional gastrointestinal disorder can cause changes in bowel habits, abdominal discomfort, and mucus in the stool. Stress and dietary factors often exacerbate IBS symptoms.

- Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease or ulcerative colitis can lead to inflammation of the intestinal lining, resulting in increased mucus production, abdominal pain, and changes in bowel habits.

- Infections: Certain gastrointestinal infections can also lead to increased mucus production and changes in stool consistency.

- Colon Polyps or Cancer: While less common, the presence of mucus can sometimes be associated with polyps or malignancies in the colon, especially if accompanied by other symptoms like weight loss, significant changes in bowel habits, or blood in the stool.

3. Importance of Medical Evaluation: Given your symptoms, it is crucial to consult a healthcare professional for a thorough evaluation. A physical examination, including a digital rectal exam, can provide valuable information. Additionally, further diagnostic tests such as a colonoscopy may be warranted to visualize the colon and obtain biopsies if necessary.

4. Diet and Lifestyle Modifications: Since you mentioned that you have started eating more fruits and vegetables, this is a positive step. A high-fiber diet can help regulate bowel movements and may alleviate some symptoms. However, it is also essential to stay hydrated and consider reducing processed foods, which can exacerbate gastrointestinal symptoms.

5. Medication and Treatment: If your symptoms are related to IBS or another inflammatory condition, your healthcare provider may recommend medications to help manage your symptoms. This could include antispasmodics, laxatives, or anti-inflammatory medications depending on the underlying cause.

6. Monitoring Symptoms: Keep a detailed record of your symptoms, including any changes in bowel habits, the appearance of your stool, and any associated symptoms like abdominal pain or changes in appetite. This information can be invaluable for your healthcare provider in determining the best course of action.

In conclusion, while the presence of mucus in your stool and the discomfort you are experiencing can be indicative of several gastrointestinal issues, it is essential to seek a professional evaluation to rule out serious conditions and receive appropriate treatment. Early intervention can significantly improve outcomes and help you manage your symptoms effectively.

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