Early research also indicates there could be some differences in symptoms between men and women.

When your large intestine, or colon, is working smoothly, you hardly think about it. But when it isn’t functioning properly, it can create a host of problems far beyond constipation or diarrhea. It ...

Changes in stool appearance Bright red or dark, tarry stools, or the presence of mucus, may indicate bleeding in the gastrointestinal tract, colon, or rectum. General health changes Unexplained weight ...

Colorectal cancer symptoms a Mayo Clinic gastroenterologist monitors in himself include seeing blood with a bowel movement and abdominal pain.

I had rectal bleeding, the most common symptom of colon cancer in people under 45. I also had a family history of colon cancer, which pushed me to get a colonoscopy at 33. My out-of-pocket colonoscopy ...