Perimenopause symptoms, stages, how long it lasts and treatment

Name: Perimenopause symptoms, stages, how long it lasts and treatment
Creator: MenoWoman

Perimenopause is the transition before menopause, when estrogen rises and falls and periods become irregular. It usually starts in your 40s, lasts about four years on average, and ends 12 months after your final period.^2,3

Researched by the MenoWoman team. Edited by Marcela Sat. Updated 7 November 2026. We may earn from links.

See a doctor for very heavy bleeding (soaking a pad or tampon every 1 to 2 hours, or large clots), bleeding that lasts more than 7 days, bleeding between periods or after sex, or periods less than 21 days apart.^1,2 Any bleeding after 12 months without a period must be checked.¹⁰ If you use hormone therapy, get urgent help for a painful, swollen leg, chest pain or sudden breathlessness, which can be signs of a blood clot.

What is perimenopause?

Perimenopause means "around menopause". It is the stage when your ovaries make estrogen less evenly, so levels swing up and down.¹ Ovulation becomes less regular, and periods change in timing and flow.¹

The Menopause Society says perimenopause begins when the time between periods starts to change. It ends one year after the final period.³ The World Health Organization uses the same definition.⁹

Most women notice it in their 40s, but it can start in the mid-30s or as late as the 50s.^1,2 For the first changes in your 40s, see signs of perimenopause at 40.

Perimenopause vs menopause

Perimenopause is the transition. Menopause is a single point: your final period, confirmed once you have gone 12 months in a row without one.^2,4 Everything after that point is postmenopause.

In perimenopause you still ovulate some of the time, so you can still get pregnant.¹ After menopause, ovulation has stopped.² Many people say "menopause" for the whole process, which can cause confusion. Our guide to the stages of menopause sets out each stage in turn.

Pregnancy is still possible in perimenopause, even when periods are irregular. If you do not want to become pregnant, keep using contraception until a doctor advises you it is safe to stop.² UK NHS guidance, which follows Faculty of Sexual and Reproductive Healthcare (FSRH) advice, suggests contraception until 2 years after the last period if you are 40 to 50, or 1 year if over 50. HRT is not a contraceptive.⁸ NICE also advises that women in perimenopause are given information about contraception.⁵

How long does perimenopause last?

Cleveland Clinic gives an average of about four years. It can last up to eight years, and for some people only a few months.² The Menopause Society gives a range of 4 to 8 years.³

Symptoms do not always stop when perimenopause ends. The US National Institute on Aging says menopause symptoms can last 2 to 8 years.⁴

Researchers split the transition into an early stage, when cycle length starts to vary by 7 days or more, and a late stage, with gaps of 60 days or more between periods.^7,1 The late stage typically lasts about 1 to 3 years.⁷

Signs that perimenopause may be ending include longer gaps between periods and, for many women, more hot flashes for a while. Hot flashes are most likely in the late transition and the first two years after the final period.⁷

Perimenopause symptoms checklist

Symptoms vary a lot. Some women have few or none; others have severe symptoms that can last several years.⁹ The most common include:

Period changes: irregular, skipped, heavier or lighter periods.²
Heat and sweating: hot flashes (hot flushes in the UK) and night sweats.²
Sleep: sleep problems, sometimes without night sweats.¹
Mood and thinking: anxiety, irritability and low mood, forgetfulness and poor concentration (brain fog).^4,1
Energy and body: fatigue, joint and muscle pain and weight gain around the middle.⁴
Sex and bladder: vaginal dryness, painful sex, low libido, and urinary urgency or leaks.¹
Skin and hair: dry or thinner skin.⁴ Women also report thinning hair, brittle nails and gray hair, though the link with hormones varies.
Less common: heart palpitations, headaches, body odor changes, tinnitus and burning mouth. Each page explains how strong the link is.

Some changes have no symptoms. Bone loss speeds up and cholesterol can rise, which raises long-term risks of osteoporosis and heart disease.¹

What is happening to your hormones

Estrogen does not simply fall in a straight line. In perimenopause it rises and falls, sometimes to higher levels than before, and these swings drive many symptoms.¹

As the supply of eggs runs down, the brain makes more follicle-stimulating hormone (FSH) to push the ovaries. FSH climbs but varies a lot from cycle to cycle, and anti-Mullerian hormone (AMH) falls to low levels.⁷ In the late transition FSH is sometimes in the menopausal range.⁷

These changes also affect bone and blood fats. Bone loss speeds up, and LDL ("bad") cholesterol tends to rise while HDL falls.¹ That is why the years around menopause are a good time to think about bone health and heart health, not only symptoms.

Some things can bring perimenopause on earlier. They include smoking, a family history of early menopause, cancer treatment, a hysterectomy, and some thyroid and autoimmune conditions.¹

How perimenopause is diagnosed

There is no single test. In women over 45, NICE, the guideline body for England, says perimenopause can be diagnosed from hot flashes or sweats plus irregular periods, without blood tests.⁵

Hormone levels swing from day to day, so a single result can mislead.² NICE advises considering an FSH blood test only for women aged 40 to 45 with symptoms, or under 40 if menopause is suspected.⁵ For women over 45, it advises against tests such as AMH for diagnosis.⁵ See are at-home menopause tests accurate? before buying one.

A doctor may run tests to rule out other causes of your symptoms.² Bring a simple diary of periods and symptoms. Symptom-tracking apps are listed under tests, apps and services.

Perimenopause treatment: the main options

Perimenopause cannot be stopped, but symptoms can be treated.² The Menopause Society says hormone therapy remains the most effective treatment for hot flashes and night sweats.⁶ For women who cannot or do not want to use hormones, several prescription medicines and cognitive behavioral therapy (CBT) have good evidence.⁶

Vaginal symptoms respond well to local treatment, even if you use nothing else.⁵ Most supplements have weak or mixed evidence. The table below rates each option; follow the links for the full evidence. Lifestyle steps such as a steady sleep routine and strength training support general health, even where they do little for hot flashes.

What it is used for: evidence rated

Option	Evidence	What the research shows
Hormone therapy (HRT)	Strong evidence	The most effective treatment for hot flashes and night sweats.⁶ NICE advises offering it after discussing benefits and risks.⁵
Non-hormonal prescription medicines	Strong evidence	SSRIs, SNRIs, gabapentin and fezolinetant are all recommended for hot flashes by The Menopause Society, based on good-quality trials.⁶
Cognitive behavioral therapy (CBT)	Strong evidence	Recommended for hot flashes by The Menopause Society.⁶ NICE also suggests it for low mood or anxiety linked to menopause.⁵
Vaginal estrogen	Strong evidence	NICE advises offering it for vaginal dryness and urinary symptoms, including alongside HRT. Serious side effects are very rare.⁵
Vaginal moisturizers and lubricants	Some evidence	NICE says they can be used alone or with vaginal estrogen for dryness and painful sex.⁵
Exercise and strength training	Weak evidence	Rated weak for hot flashes: The Menopause Society found the evidence insufficient.⁶ It is still worth doing for bone, heart and mood.
Black cohosh	Weak evidence	The Menopause Society found insufficient evidence for hot flashes.⁶ NICE notes some evidence but uncertain safety and variable products.⁵
Soy isoflavones	Weak evidence	Trial results are mixed, so The Menopause Society does not recommend them for hot flashes.⁶

Ratings explained: how we rate. Always talk to a doctor or pharmacist before starting a medicine or supplement.