Treatment Choice - Treatment Choice | Compare Prices | Find Hospital | A flexible sigmoidoscopy is a test that allows your doctor to look inside the rectum and lower part of your bowel using a narrow, flexible, tube-like telescope called a sigmoidoscope. This is carefully inserted into your back passage.<br/>The test can help find out what is causing symptoms such as changes in bowel habit or rectal pain. It is also used to check for inflammation, early signs of cancer and polyps. During the procedure, your doctor may take one or more biopsies (samples of tissue) for examination in a laboratory.<br/>If necessary, it’s possible to remove polyps and treat haemorrhoids during the procedure.