It is almost axiomatic in medical practice that internal medicine is the basis of all the specialties. This is true partly because the practice of internal medicine calls for a correlation of subjective symptoms and objective findings referable to all organs of the body, but more especially because internal medicine is based on a point of view concerning, as well as on a limitation of, the type of disorder treated. It starts and ends with pathology as its foundation. No diagnosis is complete without a correlation of the probable etiologic factors and the subsequent disturbances of the normal physiologic and biochemical processes; thus, working from cause to effect, treatment is justified only if it can be clearly shown, experimentally or by carefully controlled clinical observation, that it directly affects the known pathologic changes. The patient is studied as a whole and not as a combination of loosely connected
BARROW WH. OVERLAPPING OF DERMATOLOGY AND INTERNAL MEDICINE. Arch Derm Syphilol. 1932;26(6):961–964. doi:10.1001/archderm.1932.01450030963001
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