Perimenopause, explained in plain language
· MEREN Editorial · 9 min read
Perimenopause is the transition that ends at menopause, defined as twelve consecutive months without a period. It commonly begins in the forties and can last several years. Because it is defined in retrospect, many women move through it without anyone naming it, which is one reason symptoms are so often attributed to stress or sleep.
A moving baseline
Estradiol during this window does not decline in a straight line. It fluctuates, sometimes above premenopausal levels, while cycles shorten, lengthen, and skip. That variability explains why a single blood test rarely settles the question, and why symptoms such as disrupted sleep, temperature changes, mood shifts, and changes in memory and concentration can arrive before cycles look obviously different.
What is being studied now
Longitudinal cohorts that followed women through the transition established that bone loss and unfavorable shifts in lipids and body composition cluster around the late transition rather than after menopause. Current work is focused on which of those changes are modifiable, and on symptom treatments studied in the transition itself rather than extrapolated from postmenopausal trials.
Sources
- Study of Women's Health Across the Nation, SWAN, longitudinal cohort findings
- The Menopause Society, position statements on the menopause transition
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