Menopause is the time when the menstrual period ceases and the ovaries permanently stop releasing eggs. Menopause is considered complete when a woman has been without her period for a full year. Although menopause can occur anytime between ages 40 to 58, the average age is 51 years old.

Natural menopause is a gradual process. The ovaries begin producing lower amounts of estrogen and other steroid hormones prior to menopause during a phase called perimenopause.

When menopause occurs before the age of 40 it is called premature menopause. Premature menopause can occur naturally but may also be the result of several conditions, including:

  • Family history of premature menopause
  • Autoimmune diseases
  • X-chromosome abnormalities
  • Medical treatments (pelvic surgery, surgical removal of ovaries, chemotherapy, or pelvic radiation therapy)
  • Medications that lower estrogen levels
  • Smoking