The symptoms of ovarian failure following a hysterectomy may include hot flashes, night sweats and vaginal dryness. Menstrual patterns may change, and if ovaries were taken out, they will stop menstruating. Mood changes may include mood swings and irritability. Besides, low levels of estrogen may cause changes in libido. Ovarian failure can also impair bone health, which may influence bone density. If these manifestations occur, it is critical to seek the advice of your health care provider for proper assessment and intervention.