Perimenopause or Menopause? How to Tell Which Stage You're In (UK Guide)

Last reviewed: October 2026

If you're in your forties, sleeping badly, snapping at people you love and forgetting why you walked into the kitchen, you've probably wondered: is this it? Is this the menopause?

The honest answer is that it might be, but probably not in the way you think. Most of what women call "going through the menopause" is actually perimenopause, the years-long run-up. And the word "menopause" itself means something much more specific than most of us were ever told.

Plenty of websites will define the terms for you. This guide goes further. It helps you work out which stage you're most likely in, explains whether you need a blood test (usually you don't), and shows you how to get the most out of your GP appointment. There's also a free printable symptom tracker to take with you.

The three stages, in plain English

There are three stages, not two. Knowing which one you're in changes what's worth doing next.

1. Perimenopause: the transition
Your ovaries are winding down, and oestrogen and progesterone rise and fall unpredictably rather than following a steady monthly pattern. That unpredictability is what causes most symptoms. Perimenopause usually starts in your mid-forties and can last several years. You're still having periods, even if they've become erratic, and you can still get pregnant.

2. Menopause: a single day
Menopause is officially the point when you've gone 12 months in a row without a period. It's a milestone you can only spot looking back. In the UK, the average age is 51.

3. Postmenopause: everything after
Once you've passed that 12-month mark, you're postmenopausal for the rest of your life. Symptoms such as hot flushes often ease over time, but they can continue for years. The longer-term focus shifts towards protecting your bones and heart, because oestrogen used to do some of that work for you.

What if it's happening earlier? Menopause before 45 is called early menopause. Before 40, it's known as premature ovarian insufficiency (POI). If you're under 45 and recognise these symptoms, speak to your GP sooner rather than later, as the advice is different for you.

Self-check: are you probably in perimenopause?

You're probably in perimenopause if you're in your forties, you're still having periods (however erratic), and several of the signs below sound familiar.

The signs most people know about:

• Periods changing: closer together, further apart, heavier, lighter, or skipping months
• Hot flushes, and night sweats that leave you throwing the duvet off
• Trouble sleeping, even when you're exhausted
• Mood swings, low mood or irritability

The signs women often don't connect to hormones:

• Anxiety that's new for you, or feels out of proportion
• Brain fog: losing words, losing track, forgetting why you came upstairs
• Aching joints and muscles, or feeling stiff in the mornings
• Heart palpitations (a racing or fluttering heartbeat)
• Headaches or migraines that are new or getting worse
• Dry or itchy skin
• Vaginal dryness, discomfort during sex, or a lower sex drive
• Recurrent urinary tract infections (UTIs)

Two things are worth knowing. First, symptoms can start before your periods noticeably change, so regular periods don't rule perimenopause out. Second, several of these symptoms overlap with other conditions, such as thyroid problems or anaemia. That's one more reason to talk to your GP rather than guess, and it's why palpitations in particular should always be checked.

Signs you've reached menopause (or you're past it)

If you haven't had a period for 12 months in a row and you're not using hormonal contraception, you've most likely reached menopause and are now postmenopausal.

At this stage you might notice:

• Hot flushes and night sweats easing off gradually, though for some women they carry on for years
• Vaginal dryness and urinary symptoms becoming more noticeable, as these tend to persist rather than settle
• Changes in body shape, with weight more likely to settle around the middle
• Sleep still being disrupted for some women

Two practical points many women miss:

• Contraception. You can still get pregnant during perimenopause. NHS guidance is to keep using contraception for two years after your last period if you're under 50, or one year if you're over 50.
• Bleeding after menopause. Any vaginal bleeding after you've gone 12 months without a period isn't normal. Book a GP appointment promptly. It's usually something minor, but it always needs checking.

"Do I need a blood test?" Usually, no

This is the question that holds a lot of women back. Many expect a blood test to confirm perimenopause, and either wait for one or get told their "hormones came back normal" and leave confused.

Here's what UK guidance from NICE (the body that sets standards for the NHS) actually says:

• If you're 45 or over and have symptoms, perimenopause or menopause should be diagnosed from your symptoms alone. Blood tests aren't needed to confirm it. Hormone levels swing so much during perimenopause that a single test can look "normal" on the day, even when you're clearly in the transition.
• If you're 40 to 45, your GP may consider a blood test for a hormone called FSH.
• If you're under 40, tests are used to check for premature ovarian insufficiency.
• If you're on hormonal contraception, the pill or other hormonal methods can mask the picture, so tell your GP what you're using.

Your GP may still suggest other blood tests, for example to check your thyroid or iron levels, if your symptoms could have another cause. That's good practice, not a sign they doubt you.

The practical takeaway: you don't need to "prove" perimenopause with a test. A clear record of your symptoms is far more useful, which brings us to your appointment.

How to prepare for your GP appointment

A standard GP appointment is short, and menopause conversations rarely fit into it. A bit of preparation makes a real difference.

Before you go:

1. Track your symptoms for two to three months. Note what you feel, how often, and how much it affects your day. Use our free printable symptom tracker if it helps.
2. Pick your top three. Which symptoms are affecting your life most? Lead with those.
3. Note your period pattern, including the date of your last period.
4. Know your family history, particularly osteoporosis, breast cancer, heart disease or blood clots. These affect which treatments suit you.
5. List any medicines and supplements you take.
6. Ask for a longer appointment when you book, or ask whether anyone at the practice has a special interest in menopause.

Questions worth asking:

• Do my symptoms fit perimenopause?
• What are my treatment options, and is HRT suitable for me?
• Are there non-hormonal options? (NICE guidance includes CBT as an option for some symptoms, such as hot flushes, sleep problems and low mood.)
• What should I do about my bone health?
• When should I come back for a review?

You don't need to wait until your periods stop to discuss HRT. It can be started during perimenopause. If you're in England and end up on HRT, ask your pharmacist about the HRT prescription prepayment certificate, which can reduce the cost.

If you feel dismissed, it's reasonable to ask for a second opinion from another GP at the practice.

Where supplements fit (an honest view)

We sell supplements, so let's be straight with you: supplements don't treat perimenopause or menopause, and they're not a substitute for HRT or medical advice. What they can do is help make sure you're getting enough of the nutrients your body relies on at a time when needs and habits change. They sit alongside the basics that make the biggest difference: sleep, strength exercise, cutting back on alcohol, and eating well.

With that said, here's where we think they genuinely earn a place:

Bones (perimenopause onwards). Falling oestrogen speeds up bone loss, so bone health matters from your forties onwards. Weight-bearing and strength exercise come first. Calcium, vitamin D, magnesium and vitamin K all contribute to the maintenance of normal bones. Our Good To The Bone Formula combines all four in one daily formula.

Tiredness and mood. Magnesium contributes to normal psychological function and to the reduction of tiredness and fatigue. Our Magnesium Complex uses three forms of magnesium.

Energy and hormonal activity. Vitamin B6 contributes to the regulation of hormonal activity, and vitamins B6 and B12 contribute to the reduction of tiredness and fatigue. Our Vitamin B Complex Daily contains all eight B vitamins in one capsule.

A note on vitamin D. The NHS advises everyone in the UK to consider taking 10 micrograms of vitamin D a day during autumn and winter, whatever your stage.

If you take any prescribed medication, or you're starting HRT, check with your GP or pharmacist before adding a supplement.

The bottom line

• Perimenopause is the years-long transition, when most symptoms happen and you're still having periods.
• Menopause is one point in time: 12 months without a period.
• Postmenopause is everything after, when looking after your bones and heart matters most.
• If you're 45 or over, you shouldn't need a blood test to be diagnosed. Your symptoms are the evidence, so track them.

You don't have to just put up with it. Write down what's happening, book the appointment, and ask the questions.

This article is for general information and isn't a substitute for advice from your GP or another healthcare professional.

Sources

• NHS: Menopause
• NICE guideline NG23: Menopause: identification and management
• NICE quality standard QS143: Diagnosing perimenopause and menopause
• NHS: Vitamin D
• GB Nutrition and Health Claims register