Functional uterine bleeding is commonly seen in adolescence and menopause, primarily caused by the absence of normal ovulation. Without ovulation, there is no production of progesterone, leading to irregular vaginal bleeding or heavy bleeding under the influence of estrogen. The main treatment method is menstrual regulation. For adolescent girls, menstrual regulation and ovulation induction treatment are needed, as this is caused by abnormal development of the gonadal axis. Progesterone can be used for menstrual regulation. In menopausal women, menopausal functional uterine bleeding mostly results from abnormal ovulation, essentially due to a lack of progesterone, so treatment with progesterone can be applied. (Please use medication under the guidance of a doctor.)