What are the indications for a colonoscopy?

A change of bowel habits, finding blood in your stool or when you wipe yourself, abdominal pain, weight loss, anemia, constipation, diarrhea, a family history of colon cancer, a personal history of colon polyps, a personal history of breast cancer, inflammatory bowel disease, an abnormal CT Scan, MRI, or barium studies, and other symptoms that may be related to gastrointestinal disturbances.