The term “great aunt” refers to menstruation. If you don’t have your period for three months and you are not pregnant, you may have scanty periods or amenorrhea, which can be associated with a variety of causes, including polycystic ovary syndrome, premature ovarian failure, or uterine amenorrhea. 1. Premature ovarian failure: before the age of 40, the ovaries are depleted of follicles or there is medical damage, such as radiotherapy, chemotherapy, etc., thus ovarian failure occurs, and low estrogen and high gonadotropin occur, which manifests as amenorrhea or scanty menstruation. 2. Polycystic ovary syndrome (PCOS): its occurrence can be related to abnormal regulation of the hypothalamic-pituitary-ovarian axis, insulin resistance and hyperinsulinemia, and abnormal adrenal endocrine function. There may be endocrine abnormalities such as excess androgen and excess estrone, menstrual disorders, scanty menstruation or amenorrhea. 3. Uterine amenorrhea: such as scraping or abortion scraping excessive damage to the uterine lining, causing adhesions in the uterine cavity and lead to amenorrhea. Three months without menstruation is recommended to go to the hospital specialist in time, clear cause, targeted treatment.