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