| | 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 How to Qualify for Medicaid in Maryland been a month since the last period. Should you be worried? What do dentists wear? Treatment for Second-Degree Burns Bipolar II Disorder Sources of Organic Chicken How to Care for Hemmoroids