The general practitioner treats adults. The general practitioner cooperates with specialists, such as surgeons, infectologists, psychologists, ENT specialists and ophthalmologists. Among them are internists. The internist plays the role of a general practitioner and provides specialist aftercare.
The internist is a specialist focusing on internal medicine. That is a field comprising the following areas: cardiology (heart), angiology (vessels), pneumology (lungs), gastroenterology (digestive system), metabolism, hematology (blood), rheumatology (joints), nephrology (kidneys) and endocrinology (hormones and glands).