Internal medicine is the branch and specialty of medicine concerning the diagnosis and nonsurgical treatment of diseases in adults, especially of internal organs. While the name "internal medicine" may lead one to believe that internists only treat "internal" problems, this is not the case. Doctors of internal medicine treat the whole person, not just internal organs. General internists practice medicine from a primary care perspective but they can treat and manage many ailments and are usually the most adept at treating a broad range of diseases affecting adults. Most older adults in the United States see an internist as their primary physician.