Perimenopause — how to recognise the signs and what helps
Quick answer
Perimenopause is the transition leading up to the menopause, when hormone levels start to fluctuate and periods become irregular. It usually begins in your 40s, sometimes earlier, and can last several years. Common signs include hot flushes, mood changes, sleep problems and irregular periods. A clinician can usually confirm it from your symptoms and talk through treatment options, including HRT.
What is perimenopause?
Perimenopause is the phase leading up to the menopause, when your ovaries gradually produce less oestrogen and progesterone and your menstrual cycle starts to change. It ends when you've gone 12 months without a period, which is the point defined as the menopause itself. Everything before that — sometimes lasting several years — is the perimenopause.
It's a normal, natural part of ageing rather than a medical problem, but the hormone changes involved can cause a wide range of symptoms that affect daily life, sleep, mood and relationships. For some people the transition is barely noticeable; for others it's disruptive enough to need support. Understanding what's happening in your body — and that it's a recognised, well-understood stage rather than something going wrong — can make it easier to manage and easier to know when to ask for help.
Because perimenopause develops gradually, symptoms are often mistaken for stress, ageing generally, or another health issue. Recognising the pattern is usually the first step towards getting the right support.
Every part of the transition — the age it starts, how long it lasts and which symptoms show up — is influenced by a mix of genetics, general health and, to some extent, chance. There's no single "typical" experience, which is why comparing notes with friends or family can sometimes be reassuring and sometimes just add to the confusion.
When does perimenopause start?
Most people notice the first signs in their 40s, with the average age for periods to stop completely (the menopause) falling between 45 and 55. Perimenopause itself can begin several years before that, so it's entirely possible to notice symptoms while your periods are still broadly regular, or before you've made any conscious connection to your hormones at all.
The transition typically lasts anywhere from a couple of years to closer to a decade, and both the length and the pattern of symptoms vary considerably from person to person — there's no single, predictable timeline. Some people move through it with mild, manageable changes; others experience a more turbulent few years before things settle.
If symptoms of perimenopause or menopause start before the age of 40, this is called premature ovarian insufficiency (POI). It's less common, but it's worth discussing with a clinician promptly, as the assessment — usually including blood tests — and the treatment approach are different from perimenopause at a typical age, partly because of the longer-term health implications of lower oestrogen levels at a younger age.
Common signs and symptoms
The most widely recognised symptoms are hot flushes and night sweats, but perimenopause can involve a much wider range of changes, and they don't all appear at once. Commonly reported signs include:
- Periods becoming heavier, lighter, more frequent, less frequent or generally less predictable
- Hot flushes and night sweats
- Sleep problems, including difficulty falling asleep or waking frequently, and ongoing fatigue
- Mood changes, low mood, increased anxiety or irritability
- Vaginal dryness or discomfort during sex
- Reduced sex drive
- Difficulty concentrating or so-called "brain fog"
- Joint aches, headaches or migraines that change in pattern
- Changes in skin and hair, such as drier skin or thinning hair
Not everyone experiences all of these, and symptoms can come and go rather than following a steady, predictable pattern — you might have a settled few months followed by a cluster of more noticeable symptoms. For many people, changes to the menstrual cycle are the first sign that perimenopause has begun, sometimes months or years before other symptoms appear. Keeping a simple note of your cycle and any symptoms can be genuinely useful, both for spotting patterns yourself and for any conversation with a clinician.
Perimenopause vs menopause — what's the difference?
Perimenopause is the run-up period, while menopause is technically a single point in time: the day that marks 12 months since your last period. Everything after that point is described as post-menopausal, even though many people continue to use "menopause" loosely to describe the whole transition, including the years of symptoms either side of it.
In practice, many of the symptoms overlap between the two stages, which is part of why the terminology can feel confusing. The main practical difference is that during perimenopause you can still have periods, however irregular, and you can still become pregnant — a point that's often overlooked. Once you've reached the actual menopause and periods have stopped for a full year, natural pregnancy is no longer possible.
Do I need a blood test to confirm it?
Usually not. UK clinical guidance recommends that, in women aged 45 and over with typical symptoms, perimenopause and menopause can be diagnosed from the symptoms and menstrual history alone, without a hormone blood test. This is because hormone levels — particularly follicle-stimulating hormone (FSH) — fluctuate considerably during this stage, so a single reading can be misleading and doesn't reliably confirm where you are in the transition.
A blood test may still be considered if you're between 40 and 45 and have symptoms, or if you're under 40 with possible signs of premature ovarian insufficiency, where confirming the diagnosis matters more for long-term health planning. If you're using certain types of hormonal contraception, a clinician will also factor that in, since it can mask or alter typical period patterns and make symptoms harder to interpret from cycle changes alone.
Rather than a test, most assessments focus on a detailed conversation about your symptoms, your cycle history, and anything else relevant to your health — this is usually enough to guide next steps.
Managing symptoms — lifestyle and treatment options
For some people, lifestyle measures make a meaningful difference on their own: regular exercise, reducing alcohol and caffeine, keeping a consistent sleep routine, managing stress, and layering clothing to help with hot flushes are all commonly recommended starting points. Small, sustainable changes tend to work better than trying to overhaul everything at once.
Where symptoms are more disruptive to daily life, hormone replacement therapy (HRT) is the main medical treatment, and it can be started during perimenopause itself — not only after periods have stopped. Combined HRT typically pairs an oestrogen, such as Oestrogel Pump, with a progestogen like Utrogestan 100mg capsules, which helps protect the womb lining if you still have a uterus. The combination, dose and delivery method (patches, gels, tablets or a coil-based option) can all be tailored to your symptoms and preferences.
Non-hormonal options and localised vaginal treatments are also available for specific symptoms, such as vaginal dryness, and can sometimes be used alongside other measures. Any treatment decision should follow a proper assessment of your symptoms, medical history, and any contraindications, since suitability varies from person to person and isn't a one-size-fits-all decision.
When to seek help
It's worth speaking to a clinician if symptoms are affecting your quality of life, sleep, work or relationships, if your periods change suddenly or become very heavy or prolonged, or if you're simply unsure whether what you're experiencing is perimenopause or something else that needs checking separately.
You don't need to wait until symptoms become severe, and you don't need a formal diagnosis in hand before asking for support. An earlier conversation can help you understand what's happening, rule out anything else that needs attention, and plan ahead — whether that means lifestyle adjustments, treatment, or simply reassurance about what to expect over the coming months and years.
It can also help to prepare a little before an appointment: jotting down when your symptoms started, how your cycle has changed, and how much they're affecting your day-to-day life gives a clinician a clearer picture to work from, and helps make sure the conversation covers what matters most to you.
Frequently asked questions
Can perimenopause start in your 30s?
It's less common, but some people do notice symptoms in their late 30s. If symptoms of perimenopause or menopause start before 40, this is called premature ovarian insufficiency and is worth discussing with a clinician promptly, as it's assessed and managed differently from perimenopause at a typical age.
Do I still need contraception during perimenopause?
Yes. You can still ovulate and become pregnant during perimenopause, even with irregular periods, so contraception is still needed until you've reached the menopause or your clinician advises otherwise.
Does perimenopause always cause hot flushes?
No. Hot flushes and night sweats are common, but not everyone gets them. Some people mainly notice changes to their periods, mood, sleep or concentration instead, or a combination of several milder symptoms rather than one dominant one.
Is HRT only for after the menopause?
No, HRT can be started during perimenopause to help manage symptoms while your periods are still ongoing, rather than waiting until they've stopped completely. A clinician will assess your symptoms and medical history to work out whether it's suitable and which type may help.
How long does perimenopause last?
It varies considerably from person to person. For some it lasts a couple of years, while for others it can continue for closer to a decade before periods stop completely. There's no fixed timeline, which is one reason the transition can feel confusing or unpredictable.
What's the difference between perimenopause and premature ovarian insufficiency?
Perimenopause at a typical age (usually 40s) is a normal, expected transition. Premature ovarian insufficiency is when the ovaries stop working normally before age 40, causing similar symptoms earlier than usual. It's assessed with blood tests and managed with closer attention to long-term health, since lower oestrogen at a younger age carries different considerations.