Perimenopause symptoms in the UK affect millions of women, yet many go unrecognised for months or years. There are over 30 recognised symptoms of perimenopause, many of which are frequently misattributed to stress, ageing, anxiety, depression, or thyroid problems.
What is perimenopause and when does it start?
Perimenopause is the transitional phase leading up to menopause. It begins when oestrogen levels start to fluctuate and ends when you have not had a period for 12 consecutive months. In the UK, the average age of menopause is 51, but perimenopause typically begins in the mid to late forties and can last anywhere from a few months to more than ten years.
| Symptom group | Examples | Where to start |
|---|---|---|
| Cycle changes | Irregular, heavier, lighter or missed periods | Track symptoms and discuss with your GP |
| Vasomotor | Hot flushes and night sweats | Consider HRT and non-hormonal options |
| Mood and cognition | Anxiety, low mood, brain fog | Medical review plus counselling or CBT where helpful |
| Urogenital | Vaginal dryness, urinary urgency, recurrent UTIs | Ask about vaginal oestrogen and pelvic health support |
| Red flags | Chest pain, postmenopausal bleeding, stroke symptoms | Seek prompt medical advice |
Menstrual cycle changes
Changes in the menstrual cycle are usually the first sign. This includes irregular periods, cycles that are shorter or longer than usual, heavier or lighter flow, and occasional missed periods. Not all women notice cycle changes first.
Vasomotor symptoms
Around 70 per cent of perimenopausal and menopausal women experience hot flushes. Night sweats are hot flushes that occur during sleep. HRT typically reduces their frequency and severity by 80 to 90 per cent.
Sleep disturbance
Sleep problems during perimenopause are driven by night sweats, falling progesterone reducing sleep quality, and anxiety affecting sleep regulation.
Cognitive symptoms
Brain fog, difficulty concentrating, short-term memory lapses, and slowed thinking are common during perimenopause, driven by the effect of fluctuating oestrogen on the brain. These symptoms are usually functional rather than degenerative, but new, severe, or rapidly worsening cognitive symptoms should still be discussed with a clinician.
Mood and mental health symptoms
Anxiety, low mood, irritability, and loss of confidence are recognised perimenopause symptoms. Oestrogen influences serotonin, dopamine, and GABA. Declining oestrogen therefore has a direct effect on emotional stability.
Physical symptoms
Fatigue, joint and muscle pain, headaches and migraines, heart palpitations, weight changes, skin and hair changes, and changes to body odour are all recognised perimenopause symptoms.
Urogenital symptoms
Vaginal dryness, urinary urgency, frequency, and leakage, recurrent urinary tract infections, and changes in libido are all common during perimenopause and respond well to treatment.
Lesser-known and frequently missed symptoms
Tinnitus, dry eyes, dry mouth, electric shock sensations, burning mouth syndrome, digestive changes, and itchy skin (formication) are all recognised perimenopause symptoms that are frequently attributed to other causes.
When to seek help
See your GP within a few weeks if symptoms are affecting your daily life, work, sleep, or relationships. Seek urgent medical attention for chest pain, postmenopausal bleeding, sudden severe headache, or weakness and slurred speech.
For next steps, see our guides to perimenopause support in the UK, menopause blood tests, and HRT in the UK.
Frequently Asked Questions
What are the first signs of perimenopause?
The most common early signs are changes to the menstrual cycle, including irregular periods and changes in flow, alongside new or worsening premenstrual symptoms, sleep changes, mood changes, and fatigue.
How many symptoms does perimenopause have?
There are over 30 recognised symptoms of perimenopause, ranging from well-known vasomotor symptoms to lesser-known symptoms including joint pain, tinnitus, itchy skin, dry eyes, and burning mouth syndrome.
Can perimenopause symptoms start in your late thirties?
Yes. While perimenopause most commonly begins in the mid to late forties, some women begin experiencing hormonal fluctuations and associated symptoms in their late thirties.
How long do perimenopause symptoms last?
Perimenopause itself typically lasts four to eight years on average. Some symptoms, particularly vasomotor symptoms, typically reduce after menopause. Others, including urogenital symptoms, tend to worsen over time without treatment.
What is the most commonly missed perimenopause symptom?
Anxiety and brain fog are among the most frequently missed, often attributed to stress or anxiety disorders rather than hormonal change. Joint pain, heart palpitations, and itchy skin are also commonly missed.
When should I see a doctor about perimenopause symptoms?
See your GP when symptoms are affecting your daily life, sleep, work, or relationships, or when you want to discuss treatment options including HRT. Women under 45 with any perimenopause symptoms should see their GP promptly.
Can perimenopause symptoms appear before periods become irregular?
Yes. Some women experience significant perimenopause symptoms including mood changes, anxiety, sleep disturbance, brain fog, and fatigue before they notice any change in their menstrual cycle.
Is brain fog during perimenopause a sign of dementia?
No. Perimenopause-related brain fog is driven by hormonal fluctuation and is not usually a sign of dementia. It is a functional, reversible symptom that typically may improve with appropriate treatment and support, including HRT where suitable.
Where to get support next
If symptoms are affecting your sleep, work, relationships or day-to-day wellbeing, it is sensible to speak with your GP, pharmacist or a qualified menopause clinician. The Menopause Directory can also help you compare menopause symptoms hub Ask MenoAI.
This guide is general information only and is not a diagnosis or personalised medical advice. Seek urgent medical help if symptoms feel severe, sudden or worrying.
Useful UK references: NHS menopause information, NICE menopause guideline NG23 and British Menopause Society publications.
Author: The Menopause Directory
About this guide
This guide is published by The Menopause Directory editorial team to help UK readers understand menopause symptoms, support options and services. It is for general information only and should not replace advice from a GP, pharmacist or qualified menopause specialist.
Last reviewed by The Menopause Directory editorial team.