If health is a sufficient amount of Qi flowing harmoniously then any deviation from that standard is pathological. Pathology is an English term meaning the essence of disease and the funtional and structural manifestation of disease. Disharmony is a translation with a slightly broader meaning. It includes not only disease but the unhealthy behavior of Qi.
Disharmonies are a medical subset of each of the diagnostic models and the terms which name and describe use the vocabularies of the diagnostic models. Click on the links at left to learn about the major types of disharmony/pathology of Oriental medicine.