The vocabulary in this area is used loosely, including by people who should know better, and the confusion has practical consequences. Women searching for information about "menopause" mostly want information about perimenopause, and often find advice aimed at a different stage entirely.
The three stages
| Stage | What it is | Typical timing |
|---|---|---|
| Perimenopause | Hormones fluctuating; cycles becoming irregular | Commonly 40s, sometimes late 30s; lasts 4 to 10 years |
| Menopause | The final period — a single day | Average 51 to 52 in Australia |
| Postmenopause | Everything after that day | The rest of your life |
Source: health.gov.au, Jean Hailes.
The thing to hold onto: menopause is a date, not a phase. You cannot be "going through menopause" any more than you can be going through a birthday. The phase people mean is perimenopause.
Perimenopause in more detail
Clinicians generally divide it in two, and the distinction is useful because the experience differs.
Early perimenopause
Marked by increasing variability. The recognised threshold is a difference of seven days or more between consecutive cycle lengths — 27 days, then 35, then 29.
Cycles often shorten first, which catches women out. Periods seem to arrive constantly, and because the expectation is that they should become less frequent, the connection is rarely made.
Symptoms may be mild or absent at this stage, or may be present and attributed to something else. This is where most of the missed years happen.
Late perimenopause
Marked by gaps. A cycle of 60 days or more signals late perimenopause.
Periods become erratic — two months, then one, then four. Symptoms often intensify in this stage, because the hormonal swings are at their largest.
This stage typically lasts one to three years and ends with the final period.
Menopause: the date
Your final menstrual period. You cannot know it at the time; it is identified retrospectively once 12 months have passed with no bleeding.
There is no blood test that establishes this more reliably than the 12-month interval. For women over 45, diagnosis is generally made on symptoms and cycle pattern rather than bloods — because levels fluctuate so much that a single day's reading can look entirely normal mid-transition.
Postmenopause
Everything after that date, for the rest of your life.
Many symptoms settle in the years following. Hot flushes typically decline, though for about a third of women they persist considerably longer than expected. Sleep and mood often stabilise.
Two things do not follow that pattern and are worth knowing about:
Genital and urinary symptoms tend to persist and progress without attention, rather than resolving. See vaginal dryness.
Bone and heart health become more prominent considerations. The rate of bone density loss increases in the years around and after menopause, and cardiovascular risk rises. Neither is cause for alarm, and both are reasons that postmenopause is a period for active health management rather than assuming the interesting part is over.
When it happens earlier
Before 45 is early menopause. Before 40 is premature ovarian insufficiency, affecting roughly 1 in 100 women.
Both warrant prompt medical attention rather than watchful waiting, because the long-term considerations — particularly for bone and cardiovascular health — differ from menopause at the average age.
Menopause can also be brought on by surgery to remove the ovaries, or by some cancer treatments. Where that happens the transition is abrupt rather than gradual, and symptoms are often more intense as a result.
Why the stage matters
Practically, it changes what is relevant to you:
- Early perimenopause — tracking your cycle is the most useful thing you can do, and contraception still matters
- Late perimenopause — symptom management usually becomes the priority
- Postmenopause — attention shifts toward bone, heart and the genital and urinary symptoms that persist
Related
What is perimenopause? covers the biology in more depth. Heavy and irregular periods covers the cycle changes that mark each stage.