Perimenopause Symptoms: The Signs, the Age and the Timeline Nobody Warns You About

"I thought I was going mad." I have lost count of how many times a woman has sat across from me and said exactly that sentence. Not "I thought I was menopausal". Going mad. Because nobody had ever told her that anxiety, rage, sleepless nights and a mind full of fog could all be her hormones, years before her periods stopped.

Perimenopause symptoms are the physical, emotional and cognitive changes caused by fluctuating hormone levels in the years leading up to menopause. They typically begin in a woman's early to mid-forties, though they can start in the late thirties, and the transition usually lasts between four and eight years. Because the first symptoms are often emotional rather than physical, many women don't connect them to hormones at all.

That last sentence is the whole problem, so let's fix it. Here is the full picture.

The first signs of perimenopause

The earliest signs usually arrive while your periods are still regular, which is why they're so often missed or misattributed. In my experience, and in what the research consistently shows, the most common early signs are:

• Changes to your periods: heavier, lighter, shorter, longer, or arriving a few days off schedule
• Sleep that breaks: trouble falling asleep, or waking in the small hours for no reason
• New anxiety or irritability: emotional reactions that feel out of proportion and out of character
• Fatigue that rest doesn't fix
• Breast tenderness, headaches or migraines shifting their usual pattern

If several of those are new for you and you're past forty, perimenopause belongs on your list of explanations. It should not be the last thing anyone thinks of, and yet it so often is.

The full symptom picture

You may have seen articles about "the 34 symptoms of perimenopause". There's no official list of 34, and honestly the number keeps growing the more women are actually listened to, but it points at something true: this transition can touch almost every system in your body. It helps to see them grouped.

Your cycle: irregular periods, heavier or lighter bleeding, worse PMS, shorter or longer cycles, skipped periods.

Your body: hot flushes, night sweats, fatigue, joint and muscle aches, palpitations, headaches, weight gain (especially around the middle), bloating, breast tenderness, vaginal dryness, more frequent urinary infections, changes to skin and hair.

Your mind and emotions: anxiety, low mood, irritability or rage, mood swings, brain fog, forgetfulness, difficulty concentrating, loss of confidence, reduced sex drive, a feeling of simply not being yourself.

Nobody gets all of these. Most women get a shifting handful, and which handful can change from year to year as hormone levels swing. The emotional and cognitive symptoms are the ones most often missed by GPs and partners, and, crucially, by women themselves. They are also the ones I spend most of my working life helping women with, which is why several articles in this series are devoted to them.

A quick word on something you may see in search results and forums: so-called "loop cycles", where the pattern of symptoms seems to repeat in waves as hormones surge and dip. It's not a formal medical term, but it describes something real. Perimenopausal hormones don't decline smoothly; they oscillate, so symptoms often come in waves with easier stretches in between. A bad month does not mean you're getting worse. It usually just means you're in a dip of the wave.

What age does perimenopause start, and how long does it last?

For most women, perimenopause begins in the mid-forties. Some notice changes from their late thirties, and around 1 in 100 women experience menopause before 40, which is called premature ovarian insufficiency and always warrants seeing your GP.

In the UK, the average age of menopause, meaning the final period, is 51. Working backwards, a typical perimenopause spans roughly ages 43 to 51, lasting four to eight years, though both shorter and longer transitions are completely normal. Symptoms at 40 are not "too early", and symptoms at 47 are not "just stress". Both are textbook.

Do I need a test?

Probably not, and this surprises almost everyone. If you're over 45, the NICE guidance that UK GPs follow says perimenopause should be diagnosed from your symptoms and cycle changes alone. Blood tests aren't routinely needed, because hormone levels swing so much during this phase that a single reading can look "normal" on a bad week or "menopausal" on a good one. The home test kits sold online have the same limitation.

If you're 40 to 45 with symptoms, your GP may consider a blood test. Under 40, testing and referral matter, so do go.

What is genuinely useful, at any age, is a record of your symptoms. That's why I've put together a simple symptom checklist you can download, tick through, and take to your GP appointment. Download the perimenopause symptom checklist here. Women who arrive with a written picture of their symptoms consistently get better conversations and better care.

When to see your GP

See your GP if your symptoms are affecting your daily life, your work or your relationships; if you have bleeding that is very heavy, lasts longer than usual, or happens after sex or between periods; if you're under 40 with menopausal symptoms; or if low mood is sliding towards something darker. None of this is making a fuss. It's exactly what your GP is for, and there are effective options, which we'll cover properly in the article on HRT and GP conversations later in this series.

Frequently asked questions

What are the first signs of perimenopause starting?

Usually subtle changes to your periods (flow or timing), disrupted sleep, and new anxiety or irritability, often years before periods become obviously irregular. Fatigue, breast tenderness and changing headache patterns are also common early signs.

What are 7 signs of perimenopause?

Seven of the most common: irregular periods, hot flushes or night sweats, disrupted sleep, anxiety or low mood, irritability or rage, brain fog and forgetfulness, and fatigue. Experiencing several of these together in your forties is a strong signal.

At what age does perimenopause typically start?

Most commonly in the mid-forties, sometimes from the late thirties. UK average menopause is 51, with perimenopause usually beginning four to eight years earlier. Symptoms before 40 should always be checked by your GP.

Can I take HRT during perimenopause?

Yes. You don't need to wait until your periods stop; HRT can be prescribed during perimenopause and NICE guidance supports treating symptoms when they affect your life. Whether it's right for you is a conversation with your GP, and I've written a full article in this series on preparing for exactly that conversation.

Recognising yourself in this list is the first stage of the journey. If you'd like to talk about what's happening and what would help, I offer a free discovery call: book a time here. Next in the series: the emotional rollercoaster of anxiety, mood swings and rage.

This article is part of The Perimenopause Journey, a nine-part series.
Previous: part 1 · Next: part 3