Perimenopause: Symptoms, What to Expect, and When to See a Doctor

Perimenopausal symptoms are driven by fluctuating oestrogen and progesterone levels. The range of possible symptoms is broader than most women expect, and the experience varies considerably from person to person. The Royal Australian College of General Practitioners (RACGP) identifies the following as common perimenopausal symptoms.

Irregular periods. This is often the first noticeable sign. Cycles may become shorter (every 21 to 24 days instead of the usual 28), longer (35 to 40 days), or unpredictable. Flow may be heavier or lighter than normal. Some women experience spotting between periods.

Hot flushes and night sweats. A sudden sensation of heat spreading across the face, neck, and chest, sometimes accompanied by sweating and a rapid heartbeat. Hot flushes typically last two to five minutes and can range from mildly uncomfortable to severely disruptive. Night sweats are hot flushes that occur during sleep and can lead to waking up drenched, which in turn disrupts sleep quality.

Sleep disturbance. Difficulty falling asleep, staying asleep, or waking up feeling unrested. Changing progesterone levels can directly affect sleep architecture, making deep, restorative sleep harder to achieve.

Mood changes. Increased irritability, feelings of sadness, or anxiety that seems disproportionate to circumstances. The perimenopausal transition is associated with an increased risk of depressive episodes, even in women with no prior history of depression.

Brain fog and memory changes. Difficulty concentrating, trouble finding words, or a general sense that cognitive function is not as sharp as usual. These cognitive changes are linked to oestrogen fluctuations and are typically temporary.

Vaginal dryness and changes in sexual function. Lower oestrogen levels can lead to thinning and drying of vaginal tissue, which may cause discomfort during intercourse. Libido changes are also common.

Joint pain and muscle aches. Oestrogen has anti-inflammatory properties, and as levels decline, some women notice increased joint stiffness or generalised muscle aching.

Weight changes. Many women notice changes in body composition during perimenopause, particularly increased abdominal fat.

Other symptoms. These can include headaches, heart palpitations, urinary frequency, dry skin, and changes in hair texture or thickness.

The distinction between perimenopause and menopause is straightforward in clinical terms, but often blurred in everyday conversation.

Perimenopause is the transition period. It begins when hormonal changes start causing symptoms and/or menstrual irregularities. A woman in perimenopause is still having periods, even if they are irregular. Perimenopause can last anywhere from a few months to more than a decade, though four to eight years is typical according to the Australasian Menopause Society.

Menopause is defined retrospectively: it is confirmed once a woman has gone 12 consecutive months without a period. The average age of menopause in Australia is 51, though it can occur anywhere between 45 and 55.

Postmenopause is everything after menopause. Some symptoms (such as hot flushes) may continue into postmenopause, while others (such as irregular periods, by definition) stop.

One practical implication is that women in perimenopause may still be able to become pregnant. Fertility declines significantly during perimenopause, but ovulation can still occur, even when cycles are irregular. Women who do not wish to become pregnant should continue using contraception until 12 months after their last period if they are over 50, or 24 months if they are under 50. This is consistent with guidance from Family Planning Australia.

Not every woman in perimenopause needs medical intervention. Some women transition through perimenopause with minimal symptoms. For others, symptoms can be severe enough to affect work performance, relationships, sleep, and overall wellbeing.

The RACGP recommends seeing a doctor if you experience any of the following.

Periods that are significantly heavier than usual, or lasting longer than seven days. Very heavy bleeding can sometimes indicate conditions other than perimenopause, such as fibroids or endometrial changes, that require investigation.

Symptoms that are affecting your quality of life. If hot flushes are disrupting your sleep multiple times a week, if mood changes are straining your relationships or affecting your ability to work, or if brain fog is making it difficult to concentrate, these are valid reasons to seek help.

Bleeding after sex or between periods. While irregular periods are expected during perimenopause, bleeding after intercourse or spotting between cycles should always be discussed with a doctor to rule out other causes.

Mood symptoms that feel like more than normal irritability. If you are experiencing persistent low mood, anxiety that feels unmanageable, or any thoughts of self-harm, it is important to seek support. Perimenopausal depression is a recognised clinical entity, and it responds to treatment.

Symptoms that started before age 40. This may indicate premature ovarian insufficiency (POI), which affects approximately 1 in 100 Australian women under 40 according to Healthdirect Australia. POI has additional health implications and warrants specialist assessment.

If you are unsure whether what you are experiencing is perimenopause, that alone is a good enough reason to book a consultation. A GP can help clarify what is happening, order blood tests if appropriate, and discuss management options tailored to your situation.