An internal medicine specialist, also known as an internist, is a physician who specializes in the prevention, diagnosis, and treatment of diseases that are exclusive to adults. These professionals are highly trained in the care of chronic and complex medical conditions that affect the internal organs of the body. Other synonyms for internal medicine specialist include adult medicine specialist, medical specialist, and general internist. In addition, internists may also hold titles such as primary care physician, hospitalist, or infectious disease specialist, depending on their area of expertise. Their vast knowledge of the human body and its functions make them an important part of the medical profession, and their excellence and dedication to their profession make them an integral part of any healthcare team.