According to the menstrual cycle evolution and growth and decline of yin and Yang change rules, under the guidance of the basic theory of traditional Chinese medicine, this paper explained the disorder mechanism of the elevated androgen and reduced estrogen induced by irregular menstrual cycle in polycystic ovary syndrome （PCOS）. We also follow the aim of ＂observe the location of Yin and Yang to regulate and balance Yin-Yang＂ in Neijing. ＂Yin and Yang in equilibrium＂ can make PCOS patients reach the balance of Yin and Yang and elevated estrogen and reduced androgen, a...
