Perimenopause: Recognising the Changes

Why your periods, sleep, mood and body may suddenly feel different — and what can actually help

Perimenopause can be confusing because it rarely begins with one dramatic change.

Periods may become less predictable. Sleep becomes lighter. You feel hotter than you used to. Your mood feels different. Your concentration is not quite as sharp. Sex may become uncomfortable or your libido may change.

And yet you may still be having periods.

That is often the point when people wonder:

“Can this really be menopause if I’m still menstruating?”

Yes.

Perimenopause is the transition leading up to menopause, and symptoms commonly begin while periods are still occurring.

What is perimenopause?

Perimenopause is the stage when ovarian hormone production becomes less predictable as you approach your final menstrual period.

In particular, oestrogen levels fluctuate rather than simply falling smoothly.

That helps explain why symptoms can come and go.

You may have several difficult weeks followed by a period when you feel almost normal again.

Periods may initially remain regular, then become:

• shorter or longer apart
• heavier or lighter
• less predictable
• occasionally missed altogether.

Perimenopause can last several years, although there is considerable individual variation.

When is it actually menopause?

Menopause itself is technically your final menstrual period.

You only know that it was your final period afterwards.

For most people who are not using hormonal treatment that alters bleeding patterns, menopause is recognised after 12 months without a period.

The years of changing periods and symptoms leading up to that point are the menopausal transition, or perimenopause.

What age does perimenopause begin?

It commonly starts during the 40s, although it can begin earlier.

Natural menopause most commonly occurs between about 45 and 55 years.

If menstrual cycles become irregular or stop before age 45, it deserves more deliberate assessment.

Menopause between 40 and 45 is considered early menopause.

Loss of ovarian function before age 40 may represent premature ovarian insufficiency, or POI, and requires specific assessment.

POI is not necessarily the same as permanent menopause. Ovarian activity can sometimes be intermittent.

This matters because earlier loss of ovarian function can affect:

• fertility
• bone health
• cardiovascular health
• long-term hormonal needs.

What symptoms can perimenopause cause?

There is no single standard symptom pattern.

Common symptoms include:

• changing or irregular periods
• hot flushes
• night sweats
• difficulty falling or staying asleep
• fatigue
• mood changes
• irritability
• anxiety
• lower mood
• difficulty concentrating or “brain fog”
• headaches or worsening migraine
• joint and muscle aches
• reduced libido
• vaginal dryness or irritation
• discomfort during sex
• urinary urgency or recurrent urinary symptoms.

But an important point is:

Not every new symptom in your 40s is automatically caused by perimenopause.

Could something else be causing the symptoms?

Yes.

This is where a GP assessment can be useful.

Symptoms such as fatigue, poor sleep, anxiety, palpitations and concentration problems can also occur with:

• thyroid disease
• iron deficiency
• depression or anxiety disorders
• sleep apnoea
• medication effects
• pregnancy
• excessive alcohol
• chronic stress
• other medical conditions.

Heavy or irregular bleeding may also have causes unrelated to menopause.

Perimenopause is common, but it should not become a label that prevents other explanations being considered.

Do I need hormone blood tests to diagnose perimenopause?

Usually not.

This surprises many people.

In someone over about 45 with typical symptoms and changing menstrual cycles, perimenopause is generally a clinical diagnosis based on the history.

Hormone levels such as FSH can fluctuate significantly during perimenopause. A blood test taken on one day can therefore be misleading.

Blood tests may still be useful when:

• symptoms begin unusually early
• the diagnosis is uncertain
• periods cannot be used to judge menopausal status
• another medical condition is being considered.

The useful question is not simply:

“What is my hormone level today?”

It is:

“Does the overall pattern fit perimenopause, and is there anything else we need to exclude?”

What should happen to my periods?

Almost anything can happen to the timing.

Cycles may shorten initially and later become more widely spaced.

Some periods become heavier. Others become lighter.

Occasional skipped periods are common.

But perimenopause should not be used to explain every abnormal bleeding pattern without assessment.

See your GP if you develop:

• very heavy bleeding
• bleeding lasting much longer than usual
• bleeding between periods
• bleeding after sex
• a major new change in your bleeding pattern
• bleeding that is causing dizziness, fatigue or possible iron deficiency.

And once you have gone 12 months without a period, any new vaginal bleeding should be medically assessed rather than assumed to be a period returning.

Can I still get pregnant?

Yes.

Ovulation becomes less predictable during perimenopause, but it does not stop immediately.

Pregnancy is still possible until menopause has occurred.

This creates an important distinction:

Menopausal hormone therapy is not contraception.

If pregnancy would be a problem for you, discuss contraception separately with your GP.

When contraception can safely stop depends on your age, menstrual history and the type of contraception you use, so it is worth checking rather than simply stopping contraception when periods become irregular.

Why has my sleep suddenly become terrible?

Sleep disturbance is extremely common around menopause.

Night sweats can wake you, but hormone changes may also affect sleep even when you do not have obvious hot flushes.

Other contributors become increasingly common in midlife too, including:

• stress
• alcohol
• caffeine
• chronic pain
• snoring and sleep apnoea
• restless legs
• caring responsibilities
• mood disorders.

If you are exhausted despite spending enough time in bed, particularly if you snore heavily or someone has noticed pauses in your breathing, do not assume menopause is the whole explanation.

Is “brain fog” real?

Many people describe:

• forgetting names
• losing their train of thought
• struggling to find words
• difficulty multitasking
• feeling less mentally sharp.

These symptoms can occur during the menopausal transition.

Poor sleep, stress and mood changes can make them worse.

They are usually not the same thing as dementia.

But significant or progressive memory problems still deserve assessment, particularly if they interfere with everyday function.

Why has my mood changed?

Hormonal fluctuation can affect mood during perimenopause.

Some people notice:

• increased irritability
• anxiety
• low mood
• reduced resilience
• feeling unusually overwhelmed.

But menopause does not explain every mental-health symptom.

Major depression and anxiety still require proper assessment and treatment.

If mood symptoms are persistent, severe, or affecting relationships or your ability to function, tell your GP.

Do not assume you simply have to “push through” because you are in your 40s.

What can I do myself?

The basics do matter, although they are not a cure for every menopausal symptom.

Useful foundations include:

• regular physical activity
• resistance exercise
• adequate sleep opportunity
• limiting alcohol if it worsens symptoms or sleep
• not smoking
• a nutritious eating pattern
• maintaining muscle and bone health
• stress-management strategies that are realistic for you.

The aim is not to imply that symptoms are caused by poor lifestyle.

It is to improve the things that can be improved while treating symptoms that still need treatment.

What is menopausal hormone therapy?

Menopausal hormone therapy, usually shortened to MHT, is also commonly called hormone replacement therapy or HRT.

It usually involves replacing oestrogen, with a progestogen added when needed to protect the lining of the uterus.

MHT is the most effective treatment for troublesome hot flushes and night sweats and can also improve some other menopausal symptoms.

It comes in several forms, including:

• tablets
• patches
• gels
• vaginal treatments
• combinations involving progesterone or other progestogens.

The best option depends on your symptoms, whether you still have a uterus, your bleeding pattern and your medical history.

Is MHT dangerous?

For many healthy women with troublesome symptoms who are around the usual age of menopause, the benefits of appropriately prescribed MHT are likely to outweigh the risks.

However, MHT is not suitable for everyone.

The balance can be different if you have, for example:

• certain hormone-sensitive cancers
• previous blood clots
• certain cardiovascular conditions
• significant liver disease
• unexplained vaginal bleeding.

This is why the decision is individual rather than a simple “HRT is safe” or “HRT is dangerous”.

Do I have to wait until my periods stop before starting MHT?

No.

If symptoms are significant, MHT can be used during perimenopause.

You do not have to wait until you have been period-free for 12 months before discussing treatment.

The exact hormonal regimen may differ depending on whether you are still menstruating.

What if I don’t want or can’t take hormones?

There are alternatives.

Depending on which symptom is most troublesome, options may include:

• prescription non-hormonal medicines
• psychological approaches
• sleep treatment
• vaginal moisturisers or lubricants
• targeted treatment for urinary or vaginal symptoms.

Several prescription non-hormonal medicines can reduce hot flushes in selected people.

The important point is that treatment should match the symptom you actually want to improve.

A treatment that helps hot flushes may do very little for painful sex, and vice versa.

What about vaginal dryness and painful sex?

Declining oestrogen can affect the vagina, vulva and urinary tract.

Symptoms can include:

• dryness
• burning
• irritation
• pain during sex
• urinary urgency
• recurrent urinary infections.

These symptoms may persist or worsen after periods stop.

Local vaginal oestrogen can be very effective for appropriate patients and produces much lower systemic hormone exposure than standard whole-body MHT.

Other non-hormonal options such as moisturisers and lubricants can also help.

Do not assume painful sex is simply something that has to be accepted with age.

What about weight gain?

Body composition often changes during midlife.

People may notice more fat around the abdomen and more difficulty maintaining muscle.

Hormonal change can contribute, but so can:

• age-related muscle loss
• reduced activity
• poor sleep
• stress
• changes in eating patterns.

Perimenopause does not make weight management impossible.

The more useful focus is often on maintaining muscle, fitness, sleep and metabolic health, rather than chasing a particular number on the scale.

Do supplements help?

Be cautious with products marketed as “natural menopause cures”.

Some supplements have limited evidence, and products can vary in dose, purity and interactions.

“Natural” does not automatically mean effective or harmless.

If you are taking supplements, mention them to your GP or pharmacist.

Questions people commonly ask

I’m still having regular periods. Can I really be perimenopausal?

Yes.

Symptoms can begin while cycles are still regular.

Period changes often become more obvious later in the transition.

Should I get an FSH test?

Usually not if you are over 45 and have a typical pattern.

FSH can fluctuate substantially during perimenopause, so a single result may add little.

Testing is more useful when the situation is atypical or menopause appears to be occurring unusually early.

Am I too young for this at 42?

Not necessarily.

Perimenopause can begin in the early 40s.

However, menopause before age 45 warrants more careful assessment, particularly if periods are stopping rather than simply becoming irregular.

Do I need treatment?

Only if symptoms are bothering you or there is another clinical reason to treat.

Perimenopause itself is not a disease.

Some people need little or no treatment. Others have symptoms that significantly affect sleep, work, relationships or quality of life and benefit greatly from treatment.

How long can symptoms last?

There is considerable variation.

Perimenopause itself commonly lasts several years, and some symptoms can continue after menopause.

Treatment does not need to follow an arbitrary timetable. It should be reviewed according to your symptoms, risks and preferences.

Before your appointment

It can help to note:

• how your periods have changed
• whether bleeding has become heavier
• hot flushes or night sweats
• sleep problems
• mood changes
• vaginal or urinary symptoms
• migraine changes
• medicines and supplements
• contraception
• your main concern.

You do not need to bring a list of 25 symptoms.

Try to identify the two or three changes that are affecting you most.

That makes it easier to choose treatment based on what matters most to you.

When should I seek medical review sooner?

Book a GP appointment if:

• symptoms are significantly affecting your quality of life
• periods become very heavy or prolonged
• you bleed between periods or after sex
• symptoms begin before age 45
• you think your periods may be stopping before age 40
• mood symptoms are persistent or severe
• you develop new concerning symptoms that do not fit the usual pattern.

Seek urgent care for very heavy bleeding associated with fainting, severe weakness or feeling acutely unwell.

Start with one action

If you think you may be perimenopausal, write down the three symptoms that are affecting you most.

Not every symptom needs treatment.

Start with the ones interfering most with your sleep, work, relationships or quality of life.

Then take that list to your GP.

The bottom line

Perimenopause often begins before periods stop.

Changing periods, hot flushes, sleep problems, mood changes, brain fog and vaginal or urinary symptoms can all occur as hormones fluctuate.

For most people over 45 with a typical pattern, diagnosis is based on the history rather than routine hormone blood tests.

You can still become pregnant during perimenopause, so contraception remains important until it is no longer needed.

And you do not have to simply tolerate troublesome symptoms.

Lifestyle measures can help, while menopausal hormone therapy and non-hormonal treatments are effective options for many people.

The goal is not to “fix” a normal stage of life.

It is to recognise what is happening, rule out other important causes, and treat the symptoms that are interfering with how you want to live.