A common symptom of colorectal cancer is a change in bowel habits. Symptoms include:

• Having diarrhea or constipation

• Feeling that your bowel does not empty completely

• Finding blood (either bright red or very dark) in your stool

• Finding your stools are narrower than usual

• Frequently having gas pains or cramps, or feeling full or bloated

• Losing weight with no known reason

• Feeling very tired all the time

• Having nausea or vomiting

Most often, these symptoms are not due to cancer. Other health problems can cause the same symptoms. Anyone with these symptoms should see a doctor to be diagnosed and treated as early as possible.

Usually, early cancer does not cause pain. It is important not to wait to feel pain before seeing a doctor.