This is called a sigmoidoscopy. A sigmoidoscopy involves a thin tube being inserted into the lower colon through the rectum, so the area can be viewed. Colonscopy is an examination performed under sedation, of the lining of the bowel, using a thin flexible instrument. Both colonscopy and barium enema need special preparation of the bowel to ensure it is clean and empty at the time of examination. Blood tests and tests on your bowel motions may also be necessary to rule out other disorders.
Reassurance is important.
Once a diagnosis of IBS has been made, your doctor will help you understand how your symptoms come about and will reassure you that IBS does not lead to more serious conditions. Your doctor will advise individual treatment for you. This will depend on your symptoms, and will help you to identify any factors which make your symptoms worse. If any contributing factors can be identified, these may need to be avoided or reduced by simple changes in lifestyle. Your diet may need to be modified.