The author analyzes many problems in concept definition and expression of turbidity-toxin by reviewing modern researches related to turbidity-toxin theory systematically. Based on clarifying the relationship among the concepts of turbidity-pathogen

toxin-pathogen and turbidity-toxin

the author puts forward that turbidity-toxin proposed by modern scholars refers to toxin-pathogen with the characteristics of dirty

viscous and sticking

which is the result of classifying the generic concept of toxin-pathogen. Combined with the understanding of modern medicine

the extension of the turbidity-toxin could include fat-toxin

sugar-toxin

protein-toxin

trace element-toxin

uric acid-toxin

etc. Longtime accumulation of turbidity-pathogen in body could transform into turbidity-toxin. Turbidity-toxin

phlegm-fluid retention and blood stasis are all causes of pathological products. These three causes could intermingle mutually

interact as both cause and effect

as well as interconvert into each other.