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Top 10 facts about the world. Internal medicine is a medical specialty which focuses on the diagnosis, treatment, and prevention of nonsurgical conditions in adults. This specialty has a number of subspecialties ranging from nephrology, the study of the kidneys, to immunology, the study of allergies and immune system disorders.
Doctors of internal medicine, commonly known as internists, treat and diagnose a variety of illnesses and conditions of the body's major organ systems.General internal medicine is considered a primary care specialty, and internists can serve as the main medical caregiver to almost any patient.There are also 16 board-certifiable subspecialties within internal medicine, making it one of the broadest fields of non-surgical medicine.eneral internal medicine is considered a primary care specialty, and internists can serve as the main medical caregiver to almost any patient. There are also 16 board-certifiable subspecialties within internal medicine, making it one of the broadest fields of non-surgical medicine.