Colon Polyps: 4 Warning Signs During Bowel Movements You Should Never Ignore

Colon polyps are small growths that develop on the inner lining of the large intestine (colon) or rectum. They are surprisingly common, especially in adults over the age of 45. In fact, many people have colon polyps without realizing it because they often cause no symptoms at all.

While most colon polyps are benign (non-cancerous), some types—particularly adenomatous polyps and certain serrated polyps—can gradually develop into colorectal cancer over several years if left untreated. The good news is that early detection and removal of polyps during a colonoscopy can significantly reduce the risk of colorectal cancer.

The image above suggests there are four warning signs during bowel movements that may indicate colon polyps. Although these symptoms are not specific to polyps and can be caused by many other conditions, they are important enough to discuss with a healthcare provider if they persist.

What Are Colon Polyps?

A colon polyp is an abnormal growth that forms on the lining of the colon or rectum.

There are several different types, including:

• Hyperplastic polyps (usually low cancer risk)
• Adenomatous polyps (adenomas), which can become cancerous over time
• Sessile serrated polyps, which may also carry an increased cancer risk

Most polyps grow slowly, which is why regular screening is so effective at preventing colorectal cancer.

1. Blood in the Stool

One of the most common symptoms associated with larger colon polyps is rectal bleeding.

You may notice:

• Bright red blood on toilet paper
• Blood on the surface of the stool
• Blood in the toilet bowl
• Occasionally, darker stools if bleeding occurs higher in the colon

However, blood in the stool does not automatically mean you have colon polyps.

It can also result from:

• Hemorrhoids
• Anal fissures
• Inflammatory bowel disease
• Diverticular disease
• Colorectal cancer
• Certain infections

Any unexplained rectal bleeding should be evaluated by a healthcare professional.

Suggested Image

A medical illustration showing a healthy colon compared with a colon containing polyps.

2. Persistent Changes in Bowel Habits

Everyone experiences occasional constipation or diarrhea.

However, bowel changes lasting more than two to three weeks deserve medical attention.

Possible changes include:

• Persistent constipation
• Frequent diarrhea
• Alternating constipation and diarrhea
• Narrow or ribbon-like stools
• Feeling that the bowel doesn't empty completely

These symptoms may occur with many digestive conditions, including:

• Irritable bowel syndrome (IBS)
• Infections
• Medication side effects
• Colon polyps
• Colorectal cancer

Doctors consider the duration, severity, and accompanying symptoms when determining the cause.

3. Mucus in the Stool

Some large polyps produce excess mucus.

You may notice:

• Clear mucus
• Whitish mucus
• Jelly-like material mixed with stool

Small amounts of mucus can be normal.

However, persistent or excessive mucus, especially when accompanied by blood, abdominal pain, or changes in bowel habits, should be evaluated.

Suggested Image

A physician discussing digestive health with a patient during a medical consultation.

4. Feeling That the Bowel Doesn't Empty Completely

Some people with larger rectal polyps report a sensation called tenesmus.

This is the uncomfortable feeling that you still need to have a bowel movement even after you've already gone.

Other possible symptoms include:

• Frequent urges to use the bathroom
• Straining
• Passing only small amounts of stool

Many conditions besides polyps can cause tenesmus, including inflammatory bowel disease, rectal inflammation, hemorrhoids, and colorectal cancer.

Persistent symptoms should never be ignored.

Other Possible Symptoms of Colon Polyps

Most polyps cause no symptoms, especially when they are small.

When symptoms do occur, they may include:

• Abdominal discomfort
• Unexplained iron-deficiency anemia
• Fatigue due to chronic blood loss
• Rarely, bowel obstruction from very large polyps

Because many polyps remain silent, routine screening is essential even when you feel perfectly healthy.

Suggested Image

A diagram highlighting the large intestine with several illustrated polyps.

Who Is at Higher Risk?

Several factors increase the likelihood of developing colon polyps.

These include:

• Age over 45
• Family history of colorectal cancer or polyps
• Obesity
• Smoking
• Heavy alcohol consumption
• Physical inactivity
• Diet high in processed or red meat
• Type 2 diabetes
• Certain inherited genetic syndromes

Having one or more risk factors does not mean you will develop polyps, but it may influence when screening should begin.

How Are Colon Polyps Diagnosed?

The most effective way to detect colon polyps is through a colonoscopy.

During the procedure:

• A flexible camera examines the entire colon.
• Suspicious polyps can often be removed immediately.
• Removed tissue is sent to a laboratory for analysis.

Other screening options include:

• Stool-based tests
• CT colonography (virtual colonoscopy)
• Flexible sigmoidoscopy

Your healthcare provider can recommend the most appropriate screening method based on your age, medical history, and risk factors.

Suggested Image

A gastroenterologist performing a colonoscopy in a clinical setting.

Can Colon Polyps Be Prevented?

While not all polyps can be prevented, healthy lifestyle habits may help reduce the risk.

Doctors recommend:

• Eating plenty of fruits and vegetables
• Choosing whole grains
• Limiting processed meats
• Reducing excessive red meat intake
• Maintaining a healthy body weight
• Exercising regularly
• Avoiding smoking
• Limiting alcohol consumption

These habits also support overall digestive and cardiovascular health.

When Should You See a Doctor?

Schedule a medical evaluation if you experience:

• Blood in your stool
• Persistent constipation or diarrhea
• Ongoing abdominal pain
• Unexplained weight loss
• Iron-deficiency anemia
• Changes in stool shape lasting several weeks
• A persistent feeling that your bowel does not empty completely

Although these symptoms often have causes other than colon polyps, they should not be ignored.

The Importance of Screening

One of the most encouraging facts about colorectal cancer is that it is often preventable.

Because most colorectal cancers develop from polyps over many years, detecting and removing these growths early can dramatically reduce cancer risk.

Many health organizations recommend that adults at average risk begin colorectal cancer screening at age 45, while those with a family history or other risk factors may need to start earlier. Your healthcare provider can advise you on the screening schedule that is right for you.

Final Thoughts

Colon polyps are common and often harmless, but some have the potential to become colorectal cancer if left untreated. While symptoms such as blood in the stool, persistent changes in bowel habits, mucus in the stool, and the sensation of incomplete bowel emptying can sometimes be associated with colon polyps, they are not specific and may result from many other digestive conditions.

The most effective way to protect your health is through routine colorectal cancer screening, especially after age 45 or earlier if you have additional risk factors. Paying attention to persistent digestive symptoms, maintaining a healthy lifestyle, and seeking medical advice when concerns arise can help detect problems early—when treatment is often simplest and most successful.