Internal medicine is one of the most complex fields of general medicine, in which, in addition to treatment, prevention is also playing an increasingly important role. The internal medicine specialist mainly deals with pathological changes and dysfunctions of the internal organs and organ systems. Many disciplines are based on internal medicine, such as: diabetology for diabetes, gastroenterology for the digestive system, endocrinology for hormone function, nephrology for kidney disease, cardiology for cardiovascular disease, pulmonology for the respiratory system and hematology for dealing with blood disorders.The internal medicine specialist coordinates these disciplines when treating the patient. This role is comparable to that of a general practitioner, as it may either cure only one acute illness or play a caring role for years in the treatment of chronic diseases.