Like the human life cycle, the ovaries also have their own growth and development cycle. For those who are concerned about their ovarian function, how do you know that your ovarian function is starting to go downhill? For most people, the age of 20-35 is the best time for ovarian function and the best time to conceive. Ovarian function generally starts to decline slowly from the age of 35, which includes not only the number of eggs but also the quality of eggs, so the infertility rate and the probability of miscarriage, preterm delivery and pregnancy complications will increase after the age of 35, and start to plummet at the age of 40 until the ovarian function fails during menopause, that What are the signals that your ovaries will send out to let you know when they start to decline? The main function of the ovaries is to produce eggs and ovulate and secrete estrogen and progesterone, which directly affects menstruation. Therefore, changes in menstruation are the earliest indicators of the decline of ovarian function: 1. Irregular menstruation and prolonged cycles The decrease in ovarian function, the decrease in the quantity and quality of eggs, irregular ovulation, resulting in irregular menstruation, and often anovulatory menstruation, in the initial stage is generally manifested as a prolonged menstrual cycle, to late menstrual cycle began to shorten, until menopause, the length of this period varies, can be several months, can also be several years. This prolonged menstrual cycle should be distinguished from the anovulatory prolonged menstrual cycle in polycystic ovary syndrome, and it is acceptable for young women to have a prolonged menstrual cycle once in a while, because not every month has good ovulation. 2.Decreased menstrual flow With reduced ovarian function, follicles cannot develop and mature and ovulate, producing not enough estrogen and progesterone, the thickness of the endometrium decreases and menstrual flow decreases. 3. Low estrogen-related symptoms When the eggs do not develop or are developmentally impaired, the estrogen produced becomes less, and the body can self-regulate, so most people have no symptoms. Some people may have symptoms related to low stimulating hormone levels such as hot flashes, sweating, insomnia, depression or irritability.