A normal woman should establish a regular menstrual cycle one to two years after puberty. If there is still no regular menstrual cycle or even secondary amenorrhea several years after menarche, accompanied by increased body hair and weight gain, you need to visit an obstetrician and gynecologist to see if you have a condition called “polycystic ovary syndrome “This is a condition called polycystic ovary syndrome. Polycystic ovary syndrome is a disease with clinical manifestations such as sporadic menstruation or amenorrhea, obesity, hirsutism, insulin resistance, enlarged ovaries or polycystic changes. Studies have shown that polycystic ovary syndrome has a genetic predisposition and that a mother or sister with a history of irregular menstruation is more likely to develop polycystic ovary syndrome. Patients with polycystic ovary syndrome have an increase in the number of synchronized follicles per menstrual cycle due to the malfunction of the hypothalamus-pituitary gland and metabolic disorders, with no dominant follicles. Ovulation disorders often occur. Due to ovulation disorders, the estrogen and progesterone secretion in the body is imbalanced, and the endometrium cannot grow and peel off normally during the menstrual cycle, resulting in sparse menstruation or amenorrhea. Treatment: 1. Weight reduction: For obese patients, a low-calorie diet plus exercise for weight loss is the preferred treatment. A weight loss of 5-10% can alleviate hyperinsulinemia and hyperandrogenemia and improve menstruation, ovulation and even pregnancy. 2.Adjust the menstrual cycle to prevent excessive endometrial hyperplasia and endometrial cancer: The use of oral contraceptives or progestin in the second half of the menstrual cycle causes regular exfoliation of the endometrium. After several cycles of using oral contraceptives, some patients not only improve the situation of high androgens in the body, but also can resume ovulation briefly in several cycles after stopping the pill, and can take the opportunity to get pregnant. 3. Promote fertility: Patients with polycystic ovary syndrome cannot get pregnant if they do not ovulate, and the probability of conception is reduced if ovulation is rare. Therefore, not every patient with polycystic ovary syndrome is infertile, but her chances of conceiving are lower than those of a woman with normal ovulation. If a patient with polycystic ovary syndrome is ready to get pregnant, she can finally test her basal body temperature, monitor ovulation at the hospital if possible, choose to have intercourse during ovulation, detect pregnancy at an early stage and consult a doctor at an early stage to reduce miscarriage caused by abnormal hormone levels in the body. If the basal body temperature for several cycles suggests monophase or if ovulation monitoring never reveals ovulation, you should visit a fertility specialist as early as possible and the specialist will draw up an individualized treatment plan – ovulation promotion, artificial insemination or even IVF – according to your specific situation to eventually achieve a successful pregnancy. Thankfully, the pregnancy success rate of assisted reproduction is much higher for infertility caused by simple polycystic ovary syndrome compared to other causes of infertility. 4. Follow-up treatment: Patients with polycystic ovary syndrome have an increased risk of endometrial cancer, breast cancer, ovarian cancer, and a higher risk of medical diseases such as diabetes, dyslipidemia, and cardiovascular disease than normal women. Polycystic ovary syndrome is a systemic disease of several systems and a lifelong disease that requires lifelong treatment. Therefore, the disease should not be considered cured or left to develop because the fertility mission has been accomplished, and active treatment should not be stopped. It is necessary to improve lifestyle, eat less and move more, pay attention to endometrial exfoliation, and prevent the development of metabolic diseases and gynecological tumors.