A colonoscopy is a procedure where a flexible scope is inserted through the anus to view the colon and remove polyps. It allows for early detection of colon cancer and other abnormalities. A fecal occult blood test checks stool for hidden blood and is used along with colonoscopy for colorectal cancer screening. Other tests like a barium enema x-ray the colon to identify inflammation, structural abnormalities, or issues that could cause blood in stool. Surgeries like a colostomy or colectomy may be needed to treat serious colon conditions.