Internal medicine physicians are specialists who apply scientific knowledge and clinical expertise to the diagnosis, treatment, and compassionate care of adults across the spectrum from health to complex illness. Many internists enter into practice following completion of their basic internal medicine training.  These physicians practice “general internal medicine” and are commonly referred to as “general internists.” General internists are equipped to handle the broad and comprehensive spectrum of illnesses that affect adults, and are recognized as experts in diagnosis, in treatment of chronic illness, and in health promotion and disease prevention—they are not limited to one type of medical problem or organ system. General internists are equipped to deal with whatever problem a patient brings—no matter how common or rare, or how simple or complex. They are specially trained to solve puzzling diagnostic problems and can handle severe chronic illnesses and situations where several different illnesses may strike at the same time. General internists may practice in a variety of settings. Their training uniquely qualifies them to practice primary care and follow patients over the duration of their adult lives and establish long and rewarding personal relationships with their patients. Although internists may act as primary care physicians, they are not "general practitioners," or "family physicians," whose training is not solely concentrated on adults and may include pediatrics, obstetrics.