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Madam Tan (not her real name) went to a polyclinic in January last year when she found blood in her stools. The 73-year-old had been constipated for some weeks, and laxatives had not helped.
The doctor feared that she might have colon cancer and wanted her to undergo a colonoscopy - where an endoscope is inserted into the rectum and large intestine to check for polyps and other signs of cancer.
