Colon cancer, also called colorectal cancer when it involves the rectum, is a condition that can develop gradually. In some cases, it may begin with small growths called polyps, which can remain unnoticed for years.
One important reason colorectal cancer can be difficult to recognize is that early stages may cause few or no obvious symptoms.
However, certain changes in your bowel habits, digestion, energy levels, or weight should not simply be ignored—especially when they are new, persistent, or getting worse.
Having one of these symptoms does not automatically mean you have colon cancer. Many of them can be caused by hemorrhoids, constipation, infections, dietary changes, medications, or other digestive conditions.
Still, knowing the possible warning signs can help you recognize when it may be time to speak with a healthcare professional.
Here are 10 signs of colon cancer that are worth knowing about.
1. Blood in Your Stool
Seeing blood when you go to the bathroom is one of the symptoms that deserves attention.
Blood may appear as bright red blood on toilet paper, on the surface of the stool, or in the toilet bowl. In other situations, bleeding may be less obvious and may cause stool to appear unusually dark.
However, rectal bleeding does not necessarily mean colon cancer.
Hemorrhoids and anal fissures are common causes of bright red rectal bleeding. Other digestive conditions can also cause blood in the stool.
The important point is not to automatically assume that unexplained or recurring bleeding is harmless.
If you repeatedly notice blood, especially when it occurs together with changes in bowel habits, abdominal discomfort, unexplained weight loss, or fatigue, talk with a healthcare professional.
2. Persistent Changes in Your Bowel Habits
Everyone has their own normal bowel pattern.
Some people have bowel movements once a day, while others may go more or less frequently. What matters is noticing a significant change from your usual pattern.
Possible changes include:
- New constipation
- Persistent diarrhea
- Alternating constipation and diarrhea
- Going to the bathroom much more or less frequently
- Persistent changes in stool consistency
- A bowel pattern that remains different for weeks
Temporary changes can happen because of diet, stress, medications, infections, dehydration, or other digestive problems.
But when a major change continues without an obvious explanation, it is worth discussing with a healthcare professional.
3. A Feeling That Your Bowel Has Not Completely Emptied
Have you ever gone to the bathroom but still felt as though you needed to go?
Occasional incomplete evacuation can happen with constipation or other digestive problems.
However, a persistent sensation that your bowel has not completely emptied can be one of the symptoms associated with colorectal problems.
This symptom alone does not mean cancer.
But if the sensation keeps occurring—particularly if it is accompanied by bleeding, abdominal pain, changes in bowel habits, unexplained weight loss, or persistent fatigue—it deserves medical evaluation.
4. Narrower or Unusually Shaped Stools
Another change some people notice is a persistent difference in the shape or thickness of their stool.
For example, stools may sometimes appear narrower than usual.
But it is important not to jump to conclusions based on one bowel movement.
Stool shape can change because of constipation, diet, hydration, and other temporary digestive changes.
The concern is greater when a noticeable change continues over time or appears together with other symptoms.
If your stool has remained noticeably different for an extended period, consider discussing the change with your doctor.
5. Persistent Abdominal Pain or Cramping
Abdominal pain is extremely common and can have many causes.
Gas, constipation, food intolerance, infections, indigestion, and many other conditions can cause abdominal discomfort.
However, abdominal pain, pressure, cramping, or discomfort that continues or repeatedly returns deserves attention.
Pay attention to how the symptoms change over time.
If persistent abdominal discomfort occurs together with ch
