Learn about possible warning signs of colon cancer, including bowel changes, blood in stool, abdominal pain, unexplained weight loss, and fatigue.
Colon cancer can develop slowly, and in its early stages, it may cause few or no obvious symptoms. That is why paying attention to changes in your bowel habits, digestion, and overall health can be important. While these symptoms do not necessarily mean you have colon cancer, persistent or unexplained changes should be discussed with a healthcare professional.
1. Persistent Changes in Bowel Habits
One of the most common warning signs is a noticeable change in your normal bowel pattern. This may include diarrhea, constipation, or alternating between the two. You might also notice that your stools have become narrower than usual.
If these changes continue for several weeks without an obvious explanation, it is worth speaking with a doctor.
2. Blood in Your Stool
Blood in the stool can occur for many reasons, including hemorrhoids, but it can also be a warning sign of colorectal cancer.
Bright-red blood may appear on toilet paper or on the surface of the stool, while bleeding higher in the digestive tract can make stool appear dark or tar-like. Any unexplained or recurring rectal bleeding should be medically evaluated.
3. Abdominal Pain or Cramping
Persistent abdominal discomfort, cramping, bloating, or pain can sometimes occur with problems affecting the colon. Some people may experience a feeling of pressure or discomfort that does not go away.
Because abdominal pain has many possible causes, the symptom alone does not indicate cancer. However, persistent pain accompanied by bowel changes deserves attention.
4. Feeling That You Still Need to Go
Another possible warning sign is the sensation that you need to have a bowel movement even after you have already gone. This feeling, sometimes called incomplete evacuation, can occur when something is affecting the normal passage of stool.
If this sensation becomes frequent or persistent, discuss it with a healthcare professional.
5. Unexplained Weight Loss
Losing weight without intentionally changing your diet or exercise routine can have many causes. However, unexplained weight loss can sometimes accompany serious illnesses, including colorectal cancer.
If you are losing weight unexpectedly, especially along with bowel changes, abdominal symptoms, or fatigue, arrange a medical evaluation.
6. Ongoing Fatigue or Weakness
Colon cancer can cause slow blood loss from the digestive tract. Over time, this may contribute to iron-deficiency anemia, which can cause fatigue, weakness, shortness of breath, dizziness, or reduced energy.
Persistent tiredness should not automatically be attributed to stress or lack of sleep, particularly when other symptoms are present.
7. Changes in Stool Appearance
A persistent change in the shape, color, or consistency of your stool may be worth discussing with a doctor. Narrow stools, for example, can sometimes occur when the passage through the colon is affected.
Occasional changes are usually not a reason to panic because diet, hydration, medications, and temporary digestive problems can all alter stool appearance.
When Should You See a Doctor?
You should seek medical advice if you notice persistent blood in your stool, unexplained weight loss, ongoing abdominal pain, significant changes in bowel habits, or symptoms of anemia.
These symptoms can be caused by conditions other than cancer, including hemorrhoids, infections, inflammatory bowel disease, dietary changes, and other digestive problems. The only way to determine the cause is through appropriate medical evaluation.
Depending on your symptoms, age, family history, and risk factors, a healthcare professional may recommend blood tests, stool testing, colonoscopy, or other examinations.
The Important Takeaway
Having one of these symptoms does not mean that you have colon cancer. However, persistent or unexplained symptoms should not be ignored. Colorectal cancer is often more treatable when detected earlier, which is why appropriate screening and timely medical evaluation are important.
If you are concerned about a new or persistent change in your digestive health, speak with a qualified healthcare professional rather than trying to diagnose the condition yourself.