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The presence of red blood in stool can indicate various conditions, necessitating investigation to determine the cause. Colonoscopy is the primary method for examining the colon and identifying sources of lower digestive bleeding. It allows for direct visualization of the mucosa and can reveal issues like hemorrhoids, diverticula, inflammation, polyps, or tumors. Early detection of colorectal cancer is crucial, especially with recurring bleeding or associated symptoms. Timely colonoscopy can lead to effective treatment and prevent complications.