A general practitioner is a medical doctor who treats acute and chronic illnesses and provides preventive care and health education to patients. General physician also called as Internal medicine is the medical specialty concerned with the diagnosis, management and nonsurgical treatment of unusual or serious diseases. Specialists in general medicine are commonly called, physicians. Because their patients are often seriously ill or require complex investigations, physicians are very work intensive in the hospitals. In modern practice, most physicians are subspecialists: that is, they generally limit their medical practice to problems of one organ system or to one particular area of medical knowledge. For example, gastroenterologist and nephrology specialize respectively in diseases of the gut and the kidneys.