Fuzzy Health, Illness, and Disease Sadegh-Zadeh´s framework and a program to identify diseases

Dealing with notions of health, illness and disease contains dealing with fuzziness. As the paper will demonstrate, states of these notions do not only exist or not exist. The medical philosopher and physician Sadegh-Zadeh introduced the notions of fuzzy health, fuzzy illness and fuzzy disease. A closer look will be taken on the concept of fuzzy disease. Because there are different possibilities to interpret the concept of disease, amongst others by linguistic and social backgrounds, Sadegh Zadeh indroduced potential candidates: complex _rdquohuman conditions". This notion can be taken as pre-stage of decision support in medical diagnosis. For demonstration, a computer program has been implemented and its contents are summarised.