Occurs as a result of insufficient stimulation of ovarian function by gonadotropic hormones (GH) of the pituitary gland. Reduced or inadequate secretion of GH by the pituitary gland may be observed with damage to its gonadotrophs or with decreased stimulation of gonadotrophs by luteinizing hormone of the hypothalamus, i.e. secondary ovarian hypofunction may be of pituitary genesis, hypothalamic and, more often, mixed - hypothalamic-pituitary.