1. A computerized medical diagnosis system, comprising: a) means for defining a spectrum of terms representative of a subjective description for an aspect of a medical symptom; b) means for presenting the spectrum of terms to a patient during a diagnosis session; c) means for selecting a term from among the spectrum of terms; d) means for repeating a)-c) for other aspects of the medical symptom; e) means for encoding the selected terms; and f) means for indexing a database of diseases with the encoded terms thereby diagnosing a disease.