Internal Medicine is one of the main specialties of medicine. These main specialties include surgery, ob-gyn and pediatrics. Many Sub-specialties derive from the General Internal Medicine. These subspecialties can be organ oriented like cardiology or nephrology; system oriented like immunology; age oriented like geriatric medicine or condition oriented like medicine of pregnancy. General Internal Medicine covers all aspects of the pathology of adolescents, adults and the elderly (it does not treat children). It is neither surgical nor invasive. It treats all genders without discrimination and covers every disease of every organ that is susceptible of medical (non-surgical) treatment, especially complex diseases of multiple organs with or without comorbidity.

The preferred level of attention of General Internal Medicine is curative or “secondary prevention”, although internists have the knowledge and training for primary attention. Internal Medicine can treat the medical pathologies (non obstetric) of pregnant women and the medical complications associated with surgery and anesthesia.

Internal Medicine has a strong foundation in epidemiology and evidence based medicine, nevertheless its objective is not the attention of great populations but the patient himself, using the bio-psycho-social model.

Internal Medicine stays current in the knowledge of medical technology without abusing with this technology, because its foundation is the clinical practice. Therefore, it employs semiology and complements it with therapeutics.