Although the terms ‚healthyʻ and ‚sickʻ are constantly used in our daily lives and play an essential role in our daily activities, on closer inspection they turn out to be semantically highly demanding terms. However, it is not easy to determine who is competent to provide information about these terms, their contents and their practical relevance. Moreover, it is unclear what type of knowledge is being asked for, when states of illness and health are to be described. In view of the structural changes in medicine, what significance is still attached to the concept of disease? What role does the doctor-patient relationship still play with regard to the new possibilities for medical action? Will the patient become a customer, will confidentiality be replaced by a contractual obligation, will medicine be reduced to a mere service? How does this change the human self-relationship through a new form of functionalist ‚anthropotechnologyʻ?