Winfrey, 71, said that in addition to a loss of concentration, she also suffered from heart palpitations -- a sensation of a racing or irregular heartbeat -- which she said she did not know were a symptom of menopause, the time in life when a woman's periods stop permanently.

ABC primetime television event features frank disclosures about aging from Halle Berry, Naomi Watts, Maria Shriver, medical experts and everyday women

Oprah Winfrey is breaking the silence on menopause with her new Hulu special, “An Oprah Winfrey Special: The Menopause Revolution,” aiming to support women by sharing her own challenging experiences.