| | Conditions & Treatments | Diseases What doctor treats diseases of the rectum? A proctologist is a medical doctor who specializes in the diagnosis and treatment of diseases of the rectum, anus, and colon. Proctologists are also known as colorectal surgeons. Diseases - Related Articles More Pancreatitis Condition Symptoms What is the deadly protist called naegleria that can meningitis? DNA Cloning Definition Lower Left Stomach Pain in Children What life changes should a silicosis sufferer make? How Do People Get Tapeworms? What Is a ELISA Test?