Perimenopause symptoms: what to expect in your 40s

Medically reviewed by Dr Matt Cullen MBBS, FRANZCP

If you're in your 40s and something feels off—periods that aren't behaving, sleep that isn't restoring, mood that runs hotter than it used to—this is one of the most common reasons women come to see their GP. The diagnosis, when it lands, is often perimenopause. The transition between regular cycles and menopause itself can last anywhere from a few years to a decade, and the symptoms during that window can be wide-ranging. Knowing what falls within the normal pattern helps you decide what to track, what to discuss, and what to take action on.

Key facts at a glance

• Perimenopause usually starts in the mid to late 40s, but can begin in the late 30s for some women.
• It typically lasts 4 to 8 years, comprising the menopausal transition and the 12 months following the final period.
• Symptoms come from fluctuating, rather than falling, hormone levels.
• Common symptoms span menstrual changes, vasomotor symptoms, mood, sleep, cognition, joint pain and vaginal changes.
• A clear diagnosis usually comes from symptoms and pattern, not from a single blood test.
• Pregnancy is still possible during perimenopause until 12 months after the final period.

What perimenopause actually is

Perimenopause is the lead-up to menopause, formally defined as the menopausal transition plus the 12 months following the final menstrual period. The ovaries are starting to wind down, but they're not finished. Hormone levels, particularly oestrogen, become erratic before they fall. That fluctuation is the source of most perimenopausal symptoms. It's not a smooth decline, it's a turbulent one.

Because perimenopause is a process rather than a single event, the symptom picture changes over time. Some women start with changes to their periods. Others notice mood or sleep changes first. Some have a few months of symptoms then a relatively settled stretch. Others go through a sustained period of significant symptoms. All of these patterns are within the range of normal.

The common symptom domains

Menstrual changes

Often the first sign. Cycles may become shorter, longer, heavier, lighter, or simply unpredictable. Skipped months become more common. Spotting between periods can occur. Most of this is within the normal pattern of perimenopause, but heavy bleeding, prolonged bleeding, or any concerning change is worth a GP review to make sure it's perimenopause and not something else.

Vasomotor symptoms

Hot flushes and night sweats affect around 80% of women during the menopausal transition, with more than half experiencing frequent symptoms. They can start in perimenopause well before periods stop. They vary widely in frequency and intensity, and for some women they're disruptive enough to affect work and sleep significantly.

For approximately 50% of women, frequent vasomotor symptoms last more than 7 years, and duration can extend to 10 years, particularly when symptoms begin early in the transition. Duration varies by ethnicity, with Black women experiencing the longest median duration (10 years), non-Hispanic White women around 9 years, and Chinese and Hispanic women around 5 years.

Sleep

Sleep changes are very common, even without night sweats. Women report difficulty falling asleep, waking around 3am unable to get back to sleep, and feeling unrefreshed in the morning. Poor sleep amplifies almost every other symptom.

Mood and anxiety

Mood symptoms, including increased anxiety, irritability, low mood, and feeling more emotionally reactive, are well-documented in perimenopause. The risk of major depressive episodes increases 2- to 5-fold during perimenopause compared with premenopause, with approximately 10% experiencing major depression. For women with a history of premenstrual mood symptoms or postnatal depression, the perimenopausal years can be a higher-risk period and worth flagging with a GP.

Cognitive symptoms

Word-finding difficulty, slower processing, reduced multitasking capacity. These are common and typically peak in perimenopause before stabilizing in postmenopause. While objective cognitive testing often remains normal, subjective complaints may persist. Severe or progressive cognitive symptoms warrant assessment to rule out other causes.

Joint pain and muscle aches

Often described as a new stiffness or aching, particularly first thing in the morning. The relationship between oestrogen and connective tissue, joint inflammation, and pain perception is increasingly recognised in menopause research. Recent large-scale studies show that fatigue, physical and mental exhaustion, and irritability are among the most commonly reported symptoms (affecting more than 80% of women), even more prevalent than hot flashes.

Vaginal and urinary changes

Vaginal dryness, irritation, painful sex, urinary urgency or recurrent urinary tract infections. These tend to start later in the transition but can begin in perimenopause for some women. Between 45% and 77% of women experience genitourinary syndrome of menopause. Unlike vasomotor symptoms which typically improve over time, genitourinary symptoms generally worsen and persist indefinitely, warranting ongoing attention and treatment.

Skin, hair and weight

Drier skin, hair thinning, weight gain particularly around the abdomen, all common patterns in perimenopause.

What's not standard perimenopause

Some symptoms aren't typical and warrant prompt review:

• Very heavy bleeding (changing pads or tampons every hour)
• Bleeding lasting more than 7 days
• Heavy or persistent bleeding between periods
• Bleeding after sex
• Severe pelvic pain
• Significant unintended weight loss
• Severe or persistent depression or anxiety
• Cognitive symptoms that are progressing rather than fluctuating

None of these mean something serious is going on, but they warrant proper assessment rather than being put down to perimenopause.

How perimenopause is diagnosed

For women in the typical age range with characteristic symptoms, perimenopause is usually diagnosed clinically, on the basis of history rather than blood tests. Hormone levels fluctuate so widely in perimenopause that a single blood test isn't reliable, and a normal result doesn't rule out perimenopause.

Blood tests can be useful in specific situations:

• If you're under 40 and have symptoms or absent periods (to rule out premature ovarian insufficiency)
• If you're 40-45 with symptoms or absent periods
• If you've had a hysterectomy and there's no menstrual pattern to track
• If symptoms might be due to thyroid disease or another condition
• If there's another reason a clinician wants a baseline

How to prepare for a useful GP visit

Coming prepared makes a big difference. Bring:

• A symptom list: which symptoms, how often, how severe, how long
• A period diary if you've been keeping one (or even a rough timeline of recent cycles)
• Family history: when your mother, sisters or aunts went through menopause, and any related conditions
• Your medication list, including supplements and contraception
• Specific questions you want answered

A good GP visit will involve discussing symptoms in detail, ruling out other contributors where relevant, and talking through management options. Lifestyle adjustments, sleep support, mood support, and menopausal hormone therapy are all possible elements of a plan, depending on your situation and preferences.

Important note about contraception

Pregnancy is still possible during perimenopause. Contraception should be continued until 12 months after the final period in women over 50, or 24 months after the final period in women under 50.

What to expect from here

Perimenopause is a transition, not a permanent state. Most symptoms improve once you reach postmenopause, particularly vasomotor symptoms and the more turbulent mood and sleep changes. However, unlike vasomotor symptoms which typically improve postmenopause, genitourinary symptoms generally worsen over time and persist indefinitely, warranting ongoing attention and treatment. Some changes (bone health, cardiovascular risk) become more relevant in postmenopause and warrant their own attention.

Knowing where you are in the transition is genuinely useful. It helps you make sense of symptoms, plan around them, and make decisions about treatment and lifestyle from a place of information rather than guesswork.

If you'd like to talk to an Australian clinician about your symptoms, the Chemist2U Menopause Program offers a private consultation with a partner clinician.

References

• Jean Hailes for Women's Health: Perimenopause
• Australasian Menopause Society: Perimenopause information
• Healthdirect Australia: Perimenopause symptoms
• RACGP: Approach to perimenopause in primary care
• International Menopause Society: Perimenopause position statement