Perimenopause: the symptoms and how long it lasts
Perimenopause is the years-long transition before menopause. The symptoms to expect, how long it lasts, and what helps, explained clearly.
Reviewed by Emma Carter, Senior Health & Nutrition Editor
Perimenopause catches many women off guard, because it starts years before periods stop and the symptoms rarely announce themselves as "menopause." You might notice your sleep, mood or cycle shifting long before anyone mentions the word. Knowing what to look for makes the whole transition far less confusing.
Is it perimenopause?
Perimenopause usually starts in your 40s, though it can begin earlier. It often shows up first as changes in your periods, then a shifting mix of symptoms. If several of these are new for you, perimenopause is a likely explanation:
- Periods that are irregular, heavier or lighter than usual
- Hot flashes and night sweats
- Broken sleep
- Mood swings, low mood or anxiety
- Brain fog and trouble concentrating
- Lower libido and vaginal dryness
What is happening, and how long it lasts
Your ovaries wind down estrogen and progesterone, but not smoothly, so hormones swing up and down. Your egg reserve is falling at the same time, which a blood test called AMH can reflect. That fluctuation is why symptoms come and go and no two months look alike. Perimenopause ends at menopause, defined as 12 months with no period.
On average it runs about 4 to 5 years, though it varies widely. The NHS puts the span of menopausal symptoms at 7 to 9 years, sometimes longer, and notes that they change over that time (NHS). Symptoms often change along the way. Hot flashes may fade and give way to low mood or joint aches, and some symptoms continue after menopause.
What helps
You do not have to just put up with it. Match the approach to what is bothering you most.
| Symptom | What tends to help |
|---|---|
| Hot flashes, night sweats | HRT is the most effective option for many; layers, a cool room and cutting triggers help too |
| Broken sleep | A steady wind-down, cool bedroom, limiting alcohol and late caffeine |
| Mood changes | Movement, stress support, and a talk with your doctor; HRT helps some women |
| Brain fog | Protecting sleep, regular exercise, easing the mental load where you can |
| Vaginal dryness, low libido | Vaginal moisturisers, and topical estrogen your doctor can prescribe |
| Weight gain around the middle | Protein at each meal and strength training to protect muscle and bone |
HRT is worth a specific conversation. For many women it is the most effective treatment for hot flashes and night sweats, and your doctor can weigh it against your own history.
Could it be something else?
Perimenopausal symptoms overlap with other causes, and it helps to keep that in mind. Tiredness, low mood, weight changes and brain fog can also come from thyroid problems, low iron or low vitamin D. If your symptoms do not fit the usual cycle-linked pattern, or they feel severe, ask your doctor whether a blood test to check these makes sense. Perimenopause is common, but it is not the only explanation.
You can still get pregnant
Ovulation becomes erratic in perimenopause, but it still happens. You can conceive until you have gone a full 12 months without a period, so keep using contraception if you do not want to.
When to see a doctor
See your doctor if:
- Symptoms are affecting your daily life
- Periods become very heavy
- You bleed between periods or after sex
There is a lot that helps, and bleeding that is new or unusual always deserves a check.
Frequently asked questions
What is perimenopause?
Perimenopause is the transition leading up to menopause, when hormone levels start to fluctuate and fall. It usually begins in your 40s, though it can start earlier, and ends at menopause, which is defined as 12 months with no period.
How long does perimenopause last?
On average around 4 to 5 years, but it varies widely and can last 7 years or more. Symptoms often change over that time, and some, like joint pain or vaginal dryness, can continue after menopause.
What are the first signs of perimenopause?
Often changes in your periods (irregular, heavier or lighter), plus hot flashes, night sweats, disrupted sleep, mood changes, brain fog and lower libido. Because hormones fluctuate, symptoms can come and go.
Can I still get pregnant during perimenopause?
Yes. Ovulation becomes unpredictable but still happens, so pregnancy is possible until you have gone 12 months without a period. Keep using contraception if you don't want to conceive.
References
- Perimenopause: Symptoms and causes · Mayo Clinic
- Symptoms of menopause and perimenopause · NHS
- Menopause and perimenopause · NHS