© Z CANCER FOUNDATION. All rights reserved.
The occasional bowel problem is normal, but changes in your bowels may indicate either colon or rectal cancer. These are collectively called colorectal cancers. Colon cancer can develop in any part of the colon, while rectal cancer affects the rectum, which connects the colon to the anus.
Frequent diarrhea and constipation may be symptoms of cancer, particularly if these bowel changes come on suddenly. These problems also may occur with frequent gas and abdominal pain.
A change in the caliber or size of your bowel movement may also be a symptom of cancer
Rectal bleeding may be an early sign of rectal cancer. This is especially concerning if the bleeding persists or if you are found to have iron deficiency anemia due to blood loss. You may also notice blood in your stools.