Perimenopause means "around menopause" - the transition years before your final period. During this time the ovaries' output of estrogen and progesterone becomes erratic rather than simply declining in a straight line. Some months levels swing high, others low, and that unpredictability is behind many of the symptoms women notice.
Perimenopause most often begins in a woman's 40s, though it can start earlier, and it can last anywhere from a few years to longer. Menopause is the point confirmed once you have gone 12 consecutive months without a period; everything after that is postmenopause.


