Etiology and pathogenesis Cold dampness obstruction in the uterus liver qi stagna Stasis of menstrual -tion,impairment of the blood in the uterus Chong and Ren meridians Dysmenorrhea Liver and kidney Yin defi- ciency depletion of essence Under nourishment and deficiency of bood of the uterusEtiology and pathogenesis Cold dampness obstruction in the uterus ,liver qi stagna -tion ,impairment of the Chong and Ren meridians Liver and kidney Yin defi￾ciency ,depletion of essence and deficiency of bood Stasis of menstrual blood in the uterus Under nourishment of the uterus Dysmenorrhea