Internal medicine: The medical specialty dedicated to the diagnosis and medical treatment of adults. A physician who specializes in internal medicine is referred to as an internist. Subspecialties of internal medicine include allergy and immunology, cardiology (heart diseases), endocrinology (hormone disorders), hematology (blood disorders), infectious diseases, gastroenterology (diseases of the gut), nephrology (kidney diseases), oncology (cancer), pulmonology (lung disorders), and rheumat-ology (arthritis and musculoskeletal disorders).
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