Most of the thin endometrium is caused by low estrogen levels, and the following symptoms may occur: 1. Menopausal manifestations, hot flashes, excessive sweating, irritability, emotional instability, etc., which are considered to be thin endometrium due to the decline of ovarian function. 2. Changes in menstruation, prolonged menstrual cycle, short menstrual period, low bleeding, menstrual volume between 30-80 ml, if less than 20 ml is called hypermenorrhea, which is related to thin endometrium. 3. If it is less than 20 ml, it is called hypermenorrhea, which is related to thin endometrium. 3. Loss of libido, which is related to the decrease of estrogen. 4. Causes infertility, thin endometrium can affect the implantation of pregnant eggs and embryonic development disorders, which is one of the causes of infertility. Treatment of thin endometrium can be done with artificial cycle estrogen therapy to promote endometrial proliferation and usually eat more soy products.