What perimenopause and menopause really are, what to expect, and how to walk into your next appointment with something your doctor can use.

Understanding the change

What is perimenopause?

Perimenopause is the change before menopause, when the ovaries gradually make less estrogen and progesterone. It usually starts in the mid to late forties and lasts four to ten years. Most of what people call "menopause symptoms", such as hot flushes (sudden waves of heat), broken sleep, mood swings and brain fog, actually happen during perimenopause, not after it.

How is perimenopause different from menopause?

Perimenopause is the transition. Menopause is a single point in time: the day you reach twelve months in a row without a period. You can only confirm it looking back. Everything before that day is perimenopause, and everything after it is postmenopause.

At what age does perimenopause usually start?

Most women start perimenopause in their mid to late forties. The Pakistan Menopause Society's 2026 recommendations put the average age of menopause in Pakistan at 45 to 49, lower than among white women, and NICE NG23 asks doctors to be aware that women from some ethnic minority backgrounds may reach menopause younger. Menopause before 40 is called premature ovarian insufficiency and is worth discussing with a doctor.

How long does perimenopause last?

Usually four to ten years, though for some women it ends sooner and for others it lasts longer. The last stretch before your final period tends to bring the most frequent and strongest hot flushes. Once you pass the twelve-month mark, you are postmenopausal.

How long does menopause last?

Strictly, menopause is one day: the point twelve months after your last period. Perimenopause before it often lasts four to ten years. Postmenopause after it lasts the rest of your life.

What happens after menopause?

You are postmenopausal from then on, often for three or four decades. The hormone changes of this stage can affect your sleep, heart, bones and brain, which is why it is worth keeping an eye on your health and keeping up with check-ups. Our page on postmenopause has more.

Do I need a blood test to know?

Not usually, if you are 45 or over. NICE NG23 says perimenopause is identified from symptoms and changes in your cycle in otherwise healthy women of that age, without laboratory tests. Is there a test? explains when younger women may need one.

Symptoms

What are the most common symptoms?

The most reported are irregular periods, hot flushes, night sweats, broken sleep, mood changes such as irritability and anxiety, brain fog, low energy, vaginal dryness and changes in desire. Around 80% of women have hot flushes or night sweats during the transition, according to the North American Menopause Society (NAMS).

Is brain fog really a perimenopause symptom?

Yes. Trouble concentrating, losing words mid-sentence and memory slips are well documented. The Study of Women's Health Across the Nation (SWAN) measured real dips in verbal memory and processing speed during the transition. For most women, these return to their earlier level after menopause. Brain Fog, or Something to Check? explains when to ask for a closer look.

Why is my sleep so bad?

Several things pile up at once. Night sweats wake you. Falling estrogen and progesterone change how you sleep. Worry makes it harder to drift off. And the risk of sleep apnoea, where breathing stops and starts in the night, rises in midlife. Studies estimate that 40 to 60% of women in perimenopause have clinically significant sleep problems, which is why noting your sleep next to your other symptoms tells you so much.

Can perimenopause cause anxiety and mood changes?

Yes. Hormone swings act directly on the parts of the brain that manage mood, so irritability, anxiety and low mood are common, often worst in the days before a period. Women who have had mood problems before may feel it more. These changes are physical, not "all in your head". When Worry Arrives Without a Reason and The Anger That Doesn't Feel Like Yours go further.

Getting help

How do I make the most of an appointment?

Take a record. A few weeks of notes on your sleep, mood, energy and hot flushes, with the dates of your last few periods, gives a doctor far more to work with than memory. Roshara's daily check-in takes about thirty seconds, and you can email the record to your doctor or download it as a PDF.

What if I feel dismissed?

You are not alone, and it is fair to ask for a second opinion. Unseen and Unheard explains why it happens and how to be heard.

If you are not sure where you are in the change, the Where am I? tool is a good place to start.