You have had months of broken sleep, periods that arrive when they please and a mood you no longer recognise, and someone has told you it will “settle down soon”. So how long does perimenopause last? Usually longer than women are told, and shorter than it feels at three in the morning.
These are questions I hear all the time from my patients. What they really want to know is when they will feel like themselves again. My answer is always the same: you do not have to wait for perimenopause to end before you start feeling better.
There are two clocks, and they run at different speeds
Much of the confusion comes from treating two questions as one: how long the hormonal transition lasts, and how long the symptoms last.
The transition, from the first changes in your cycle to your final period, often takes several years. In the Study of Women’s Health Across the Nation (SWAN), which followed more than 3,300 women, the median length of the transition was longest in women whose changes began earliest and shortest in those whose changes began later.
The symptoms often run on a longer clock. In the same study, women with frequent hot flushes and night sweats had them for a median of 7.4 years, and some had them for a decade or more. Among women whose final period could be clearly identified, the flushes carried on for a median of 4.5 years after it.
So if you were told perimenopause lasts “a couple of years” and you are still struggling well beyond that, nothing has gone wrong. You are simply watching the second clock.
Menopause itself is your final period. It can only be confirmed looking back, once you have gone 12 months without one, and in the UK the average age is 51. Before that, ovulation becomes less regular and hormone levels swing rather than fall in a straight line, which is why symptoms can come and go from week to week. Skipping a few months and then having a period again is normal, even if it feels as though you are back at the start.
If you are not sure which stage you are in, my article on perimenopause or menopause explains how to tell.
So how long does perimenopause last for you?
No one can give you an exact number (I wish I could!), but a few things are linked to a longer transition or longer-lasting symptoms.
When it starts. This is the strongest single influence. Women whose transition begins earlier tend to have a longer transition and longer-lasting hot flushes.
Ethnicity. In SWAN, Black women had the longest-lasting hot flushes.
Stress, anxiety and low mood. Higher stress, anxiety and depressive symptoms around the time hot flushes began were linked to symptoms lasting longer.
Other things affect when menopause arrives rather than how long it lasts. Smoking is linked to an earlier start to the transition and an earlier menopause. Surgery on the ovaries, chemotherapy or pelvic radiotherapy can bring menopause on early, sometimes abruptly.
Hot flushes get most of the attention, but changing hormones affect the brain, mood, joints, skin and bladder too, which is why brain fog, joint aches, low mood and anxiety are so common. Vaginal dryness and urinary symptoms tend to get worse without treatment. They are also among the most under-reported symptoms and among the most treatable, so please do mention them, however awkward it feels.
You don’t need a blood test to be taken seriously
If you are 45 or over and have hot flushes or night sweats along with changes to your periods, perimenopause is diagnosed from your symptoms, not from a blood test. NICE is clear on this. Hormone levels fluctuate so much that a single result can be misleading, and a normal result does not rule perimenopause out. An FSH blood test may be considered if you are 40 to 45 with symptoms and changes to your cycle, or under 40 if menopause is suspected. FSH results are not reliable if you are using combined hormonal contraception or high-dose progestogen.
Blood tests still have a place. They can rule out thyroid problems or low iron, which cause similar tiredness and low mood. And heavy bleeding, bleeding between periods or bleeding after sex should always be checked, never put down to hormones.
If you have menopausal symptoms and your periods stop before 40, you should be checked for premature ovarian insufficiency. This is diagnosed from your symptoms and a raised FSH level on two blood tests taken four to six weeks apart, never from a single test, and other causes of missed periods need to be ruled out first. Menopause between 40 and 45 is called early menopause. Both deserve a full assessment where the diagnosis is in doubt. For premature ovarian insufficiency, NICE recommends HRT or a combined hormonal contraceptive unless there is a reason not to, usually continued until at least the average age of menopause (51).
Whatever your age, here is one thing to do before your next appointment. For four weeks, write down three things each day: how you slept, whether you bled, and your worst symptom that day. “Woke at 3am, soaked.” “No period, day 52.” “Couldn’t find the word for kettle.” It takes a minute, and I promise those small notes add up to a much clearer conversation.
There is more help than most women are offered
Nothing shortens perimenopause. But its length matters far less once your symptoms are under control, and I want us to move away from the idea that you should simply wait it out.
HRT can be started while you are still having periods. NICE and the British Menopause Society both regard it as the most effective treatment for hot flushes and night sweats, and it protects bone health too. Like any treatment, it has risks as well as benefits. If you still have a womb, you need a progestogen alongside oestrogen to protect its lining.
Combined HRT carries a small increase in breast cancer risk, which rises the longer it is taken; the extra risk falls after stopping but lasts for at least ten years. Oestrogen tablets raise the risk of blood clots and stroke. Patches, gels and sprays do not raise the risk of clots at standard doses, and combined HRT using them is unlikely to raise the risk of stroke. HRT may not be suitable after certain cancers or blood clots.
If HRT is not right for you, or you would rather not take it, you still have real options (and you are not doing anything wrong by choosing them). NICE suggests menopause-specific cognitive behavioural therapy (CBT) can be considered for hot flushes, night sweats, sleep problems and low mood, and the British Menopause Society also recommends it for anxiety. It can be used alongside HRT or instead of it.
There are non-hormonal medicines too. In March 2026, NICE recommended fezolinetant for moderate to severe hot flushes and night sweats when HRT is unsuitable. It needs liver blood tests before you start, monthly for the first three months, then as your doctor advises. It is not suitable if you have, or are at high risk of, liver disease, and it must not be taken with certain other medicines, including combined contraceptive pills containing ethinylestradiol and some antibiotics such as ciprofloxacin.
If you have had breast cancer or another hormone-sensitive cancer, a specialist should assess whether it suits you. Stop taking it and seek medical advice straight away if you notice tiredness, itching, yellowing of the skin or eyes, dark urine, pale stools, nausea, vomiting, loss of appetite or tummy pain.
Elinzanetant, a similar medicine, has been licensed in the UK since July 2025, including for hot flushes caused by tamoxifen. It is still awaiting NICE appraisal, so for now it is only available on private prescription.
Certain antidepressants (SSRIs or SNRIs), gabapentin or clonidine may also be considered. Clonidine is licensed for hot flushes; the others are used off-label. Paroxetine and fluoxetine must not be taken with tamoxifen, and gabapentin is a controlled drug that can cause dependence, so these choices need a proper discussion of benefits and side effects.
Vaginal oestrogen treats dryness and urinary symptoms and, for most women, can absolutely be used long term. If you have had breast cancer, particularly oestrogen receptor-positive breast cancer, or you take an aromatase inhibitor, you may still be eligible for local HRT such as vaginal estrogen or vaginal DHEA for genitourinary symptoms, after a discussion with your doctor.
Lifestyle changes help in different ways. Strength training protects bone and muscle, and cutting back on alcohol and caffeine may reduce hot flush triggers for some women.
Until it’s over, a few safety rules still apply
Until menopause is confirmed, pregnancy is still possible. If you are not using hormonal contraception or HRT, the Faculty of Sexual and Reproductive Healthcare advises continuing contraception for two years after your last period if you are under 50, or one year if you are over 50. HRT is not a contraceptive, and it can mask your natural cycle, so if you take it, contraception is usually advised until 55, when it can be stopped. A 52 mg levonorgestrel coil can provide both contraception and the progestogen part of HRT.
Once you have gone 12 months without a period, any bleeding is postmenopausal bleeding and should be checked promptly. If you are taking HRT, report any unexpected bleeding to your doctor.
You don’t have to wait for perimenopause to end to feel better
No one can tell you exactly how long perimenopause will last for you, and some years it will feel endless (I know this can be hard!). But “wait and see” is not a treatment plan. Whether HRT suits you, doesn’t suit you or simply isn’t what you want, there is something that can help now, and a menopause consultation is where that starts. The clock will run its course either way. How you feel while it does is something we can change.
In one unhurried 45-minute consultation at 10 Harley Street, Dr Katy Kasraie will look at your health history, your goals and every suitable option, including approaches that do not involve medication. No referral needed, and most major insurers are accepted. Click here to book your appointment.