Yin deficiency in women is mainly due to the following reasons: 1) Insufficient congenital endowment; 2) Inadequate intercourse; 3) Multiple births or miscarriages; 4) Deficiency of body vitality after a serious or prolonged illness, etc. All these reasons can lead to Yin deficiency in women. Yin deficiency is mainly caused by kidney yin deficiency, heart yin deficiency and liver yin deficiency, which can be seen as soreness and weakness of the waist and knees, five heartburn, night sweating, heat in the hands and feet, and easy to develop mouth sores. It can lead to menopausal syndrome, post-pregnancy abdominal pain, post-partum abdominal pain, low menstrual flow, late menstruation, menstrual cessation and even infertility.