What are the early symptoms of colon cancer?

Bleeding, wt loss: Most colon cancers are found at screening endoscopy when they are not causing symptoms. When there are symptoms, those of anemia (short of breath, pale, tired) are common because the tumor bleeds. Colon cancer can also cause bowel obstruction with severe colicky pain, or loss of appetite and weight.

Colon cancer: Symptoms of colon cancer include rectal bleeding, weight-loss, abdominal pain, and change in bowel habits. Patients may not have any symptoms at all though.

Non specific : Early sign of colon cancer is very nonspecific to non. Therefore it is crucial to get colonoscopy as screening tools from age 50-75.

By location: Right side -- often iron deficiency anemia from blood loss. Left side -- change in bowel habits or stool caliber. Both tend to be late.