The simplest way to understand the difference between perimenopause and menopause is this: perimenopause is the transition leading up to your last period, while menopause is the point at which your periods have stopped for good. They are often spoken about as one thing, but they are distinct stages with different symptoms and timelines. This guide explains each clearly and helps you work out where you are. If your symptoms are affecting daily life, our HRT range sets out the treatment options, all of which are prescribed only after a clinical consultation.
Table of Contents
4. How Do You Know Which Stage You Are In?
5. Why the Distinction Matters for Treatment and Contraception
6. What About Premature and Early Menopause?
7.1. What is the main difference between perimenopause and menopause?
7.2. How long does perimenopause last?
7.3. Do I need a blood test to know which stage I'm in?
What Is Perimenopause?
Perimenopause means around the menopause. It is the years during which your ovaries gradually produce less oestrogen and your hormone levels begin to fluctuate. The hallmark is change: periods become irregular, perhaps closer together, further apart, heavier or lighter, and symptoms come and go as hormones rise and fall unpredictably.
Perimenopause often begins in the mid-forties, though it can start earlier or later, and it can last anywhere from a few months to several years. Crucially, you are still having periods during perimenopause, even if they are erratic, and you can still get pregnant.
What Is Menopause?
Menopause is technically a single point in time: the day that marks 12 months since your last period. In the UK the average age is around 51. Once you have gone a full year without a period, you are said to have reached menopause, and the time afterwards is called postmenopause.
So while people often say they are going through the menopause, what they usually mean is that they are in perimenopause, the stage with the most active symptoms. Menopause itself is the milestone, not the whole journey.
How the Symptoms Compare
Many symptoms overlap, because both stages involve falling oestrogen. The difference is often in the pattern. Common features include:
- Irregular periods, the defining feature of perimenopause, which stop entirely by menopause.
- Hot flushes and night sweats, common in both stages.
- Mood changes, anxiety and irritability, often more variable in perimenopause as hormones swing.
- Sleep problems, frequently linked to night sweats.
- Brain fog and poor concentration.
- Vaginal dryness and reduced libido, which can become more noticeable around and after menopause.
- Joint aches and changes to skin and hair.
How Do You Know Which Stage You Are In?
For most women, the answer comes from your periods rather than a blood test. If your periods are still happening but have become irregular and you have menopausal symptoms, you are likely in perimenopause. If you have not had a period for 12 months, you have reached menopause.
Blood tests are not usually needed to diagnose perimenopause or menopause in women over 45, because symptoms and menstrual changes tell the story. Tests may be used in younger women or where the picture is unclear. If you are unsure, a clinician can help you make sense of your symptoms.
Why the Distinction Matters for Treatment and Contraception
Knowing your stage matters for two practical reasons. First, HRT can help with symptoms in both perimenopause and menopause, and the type may be tailored to whether you are still having periods. Second, fertility does not switch off the moment symptoms start. You can still conceive in perimenopause, so contraception remains relevant, which we cover in our guide on getting pregnant during perimenopause. You can explore suitable options in our contraception range.
What About Premature and Early Menopause?
Most discussion of the difference between perimenopause and menopause assumes it happens around the average age, but for some women it arrives sooner. Menopause before the age of 40 is called premature menopause, or premature ovarian insufficiency, and between 40 and 45 it is described as early menopause. These can happen naturally or be brought on by surgery, certain cancer treatments or other medical reasons.
If you are under 45 and experiencing menopausal symptoms or changes to your periods, it is worth seeing your GP rather than assuming you are too young. Diagnosis in this age group may involve blood tests, and HRT is often recommended at least until the usual age of menopause, both for symptoms and for longer-term health.
Important: This article is general information and does not replace medical advice. Symptoms vary widely, and conditions other than the menopause can cause similar changes. A clinician can assess your individual situation. HRT and contraception are prescription treatments supplied only after a valid consultation. You can start a consultation where appropriate.
Frequently Asked Questions
What is the main difference between perimenopause and menopause?
Perimenopause is the transition before your periods stop, when hormones fluctuate and periods become irregular. Menopause is the single point 12 months after your last period. The years afterwards are called postmenopause.
How long does perimenopause last?
It varies a great deal, from a few months to several years. It often begins in the mid-forties, but the start age and duration differ widely between individuals.
Do I need a blood test to know which stage I'm in?
Usually not, if you are over 45. Your periods and symptoms are enough to tell. Blood tests may be used for younger women or when the picture is unclear.
Can I still get pregnant in perimenopause?
Yes. Ovulation still happens, even if irregularly, so pregnancy is possible until you have reached menopause. Contraception remains important during perimenopause.
