Doctors of Internal Medicine, (also known as "Internal Medical Doctors", "Internists" and "General Internists") deal with the internal organs, mainly heart, lungs, glands, kidney, stomach, and intestines. Internists are basically General Practioners (GP’s) but have much more training in the things they do, and do not deliver babies, perform surgery, or treat infants and children under 12. Because there are few General Practioners left in NewYork City, the Internist has become the family doctor ("family physician" or "family practitioner"), or in medical jargon, the Primary Care Physician.
Internists who "sub specialize" in a particular area of internal medicine may be referred to by several terms, including "medical specialist".
There are several subspecialties of internal medicine, which include, but are not limited to:
Allergy and immunology
Endocrinology (diabetes and other glandular disorders)