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Are you wondering what is Internal Medicine, and what is an Internist? 

Aptly described in Wikipedia...

"Internists" are "specialist physicians trained to manage particularly complex or multisystem disease conditions that single-organ-disease specialists may not be trained to deal with. They may be asked to tackle undifferentiated presentations that cannot be easily fitted within the expertise of a single-organ specialty, such as dyspnea, fatigue, weight loss, chest pain, confusion or change in conscious state. Internists may manage serious acute illnesses that affect multiple organ systems at the same time in a single patient, and they may manage multiple chronic diseases that a single patient may have.

General Internal Medicine specialists do not provide necessarily less expertise than single-organ specialists, rather, they are trained for a specific role of caring for patients with multiple simultaneous problems or complex comorbidities.

Perhaps because it is complex to explain treatment of diseases that are not localised to a single-organ, there has been confusion about the meaning of internal medicine and the role of an "internist". Internists are qualified physicians with postgraduate training in internal medicine and should not be confused with "interns", who are doctors in their first year of residency training (officially the term intern is no longer in use). They are also not "family physicians", "family practitioners", or "general practitioners", or "GPs", whose training is not solely concentrated on adults and may include surgery, obstetrics, and pediatrics." 

In this regard, if you are an adult with a complex medical condition, your family doctor or nurse practitioner may refer you to see an internal medicine specialist for advice on diagnosing and managing your condition.