Based on insufficiency of origin

development and existence about eight-principle syndrome differentiation

the author puts forward common diseases and syndromes with upper and lower pathogenesis to build "Yin-Yang and eight-principle syndrome differentiation method". The author thinks the eight principles

namely

upper-lower

exterior-interior

cold-heat

and deficiency-excess. Both upper-lower and exterior-interior refer to disease location

with one pair being vertical and the other horizontal

covering the whole body. Both cold-heat and deficiency-excess refer to nature of disease. The Yin-Yang is the general principle. Yin includes lower

interior

cold and deficiency.Yang includes upper

exterior

heat and excess. Thereby

this supplemented and improved the omission of the current eight-principle syndrome differentiation to "upper and lower"pathogenesis.