A professional who diagnoses and treats diseases and disorders of anus, rectum, and colon. Responsibilities include:

• Diagnoses diseases and disorders utilizing techniques, such as discussion of symptoms and medical history with patient, instrumental inspection of rectum and colon, examination of diagnostic images of affected parts, and evaluation of laboratory test results.
• Treats diseases and disorders by surgical removal or repair of diseased or malfunctioning parts, or by prescription of medication and suggestions for adaptation of patient's living habits.