Cancer is the growth of abnormal cells in the body. These extra cells grow together and form masses, lumps, or tumors. In colorectal cancer, these growths usually start as harmless (benign) polyps in the large intestine (colon or rectum).
Tests to help your doctor see if colorectal cancer has metastasized or recurred include: An abdominal ultrasound to find the cause of pain or swelling in your abdomen. A colonoscopy to see if cancer has returned to your intestine. Blood tests to find out