Hormones, in Plain Language

The three stages, simply

Menopause isn't a single event you suddenly arrive at. It's a transition that unfolds over years, with three stages.

1. 1

   Perimenopause: the transition

   Your ovaries' production of oestrogen and progesterone becomes irregular, rising and falling unpredictably rather than declining smoothly. Cycles may get shorter, longer, heavier or lighter. Symptoms can start here, often in your 40s and sometimes in your late 30s. Perimenopause lasts around four years on average, but can last up to about 10.

2. 2

   Menopause: one day

   Menopause is defined as 12 consecutive months without a period, with no other cause. It's a point in time, not a phase, and you only know you've reached it in hindsight. In the US the average age is about 51, but anywhere from the mid-40s to the mid-50s is common.

3. 3

   Postmenopause: everything after

   Hormone levels settle at a new, lower baseline. Some symptoms ease, while others, like vaginal dryness, can continue or appear. Long-term bone, heart and brain health become a bigger focus.

Surgery (such as removing both ovaries), some cancer treatments and certain conditions can cause menopause earlier or suddenly. Menopause before 40 is called premature ovarian insufficiency, and it deserves specialist care because it carries longer-term implications for bone and heart health.

Key terms in plain language

What is actually happening in your body

Oestrogen does far more than regulate periods. There are oestrogen receptors in the brain, blood vessels, bones, skin, joints, bladder and vagina. That's why its fluctuation and decline can show up in so many seemingly unrelated places at once.

Progesterone, which helps regulate cycles and has a calming effect on sleep for many women, often drops earlier in perimenopause. Testosterone, which women also produce, declines more gradually across adult life rather than suddenly at menopause.

The hormonal rollercoaster of perimenopause explains why symptoms can come and go, and why a single blood test often isn't very useful. A hormone level taken on one day may look completely different a week later.

Symptoms you might notice

Every woman's experience is different. Some sail through with few symptoms. Others find them disruptive for years. Common changes include:

Hot flushes and night sweats are the hallmark symptoms. In the large US SWAN study, which followed women through the transition, they lasted a median of 7.4 years in total and often continued for years after the final period. That's much longer than the 'a few months' many women are told to expect.

Many of these symptoms overlap with other conditions, including thyroid problems, anaemia, depression, sleep apnoea and side effects of medication. That's exactly why a proper conversation with a clinician matters, rather than assuming everything is 'just hormones'.

When to see a doctor sooner

Some symptoms need prompt attention rather than a wait-and-see approach. Contact your clinician if you notice:

• Very heavy bleeding (soaking a pad or tampon every hour or two), or bleeding that lasts much longer than usual.
• Bleeding between periods, after sex, or any bleeding after you've gone 12 months without a period.
• Chest pain, a racing heart that doesn't settle, shortness of breath or fainting.
• Low mood or anxiety that affects your daily life, or any thoughts of self-harm. Please seek help straight away.
• Symptoms starting before age 40.

The long-term picture: bone, heart and brain

Beyond day-to-day symptoms, falling oestrogen changes your long-term risk profile, and this is where a little attention in your 40s and 50s pays off for decades.

1. 1

   Bone

   Oestrogen helps protect bone. In the five to seven years after menopause, women can lose up to 20% of their bone density, raising the risk of osteoporosis and fractures later. Strength training, impact activity, enough protein, calcium and vitamin D, not smoking and limiting alcohol all help. Ask your clinician when a bone density scan makes sense for you.

2. 2

   Heart

   Cardiovascular disease is the leading cause of death in women, and risk rises after menopause as cholesterol and blood pressure often climb. Know your numbers (blood pressure, cholesterol, blood sugar) and track them yearly.

3. 3

   Brain

   Brain fog in perimenopause is real and common, and for most women it improves after the transition. Sleep, exercise, managing stress and staying socially and mentally engaged all support long-term brain health.

4. 4

   Pelvic health

   Genitourinary symptoms tend to persist or worsen without treatment. Local (vaginal) oestrogen is very effective and is considered low risk for most women. It's worth asking about, even years after menopause.

Mood, anxiety and brain fog

For many women, the psychological symptoms are the hardest part, and the least expected. Perimenopause is a time of increased vulnerability to low mood and anxiety, especially for women with a history of depression, postnatal depression or premenstrual mood symptoms. Hormonal fluctuation, broken sleep and midlife pressures all feed into it.

Brain fog, such as losing words mid-sentence, walking into a room and forgetting why, or struggling to concentrate in long meetings, is one of the most common complaints, and it can be frightening for women whose careers rest on sharp thinking. The reassuring news is that research suggests these changes are usually temporary and tend to improve after the transition. They are not a sign of early dementia for most women.

• Treat sleep as the first lever. Many cognitive and mood symptoms ease when sleep improves.
• Exercise has strong evidence for mood and cognition. Even a brisk walk helps.
• Use external systems: notes, checklists, calendar reminders and a 'parking lot' document for stray thoughts.
• Do your hardest thinking at your best time of day, and batch meetings where you can.
• Limit alcohol, which worsens mood, anxiety and sleep.
• CBT is effective for low mood, anxiety and insomnia in midlife.
• Talk to your clinician if low mood lasts more than two weeks. Treatment, whether hormonal, antidepressant, talking therapy or a combination, works.

Night sweats and sleep: a practical toolkit

Night sweats are among the biggest drivers of poor sleep in perimenopause, and poor sleep amplifies almost every other symptom. While you and your clinician work on treatment, these practical steps help:

• Keep the bedroom cool. Many people sleep best between about 60 and 67°F (15 to 19°C).
• Use layered, breathable bedding so you can throw off a layer without fully waking.
• Choose moisture-wicking sleepwear and keep a spare set by the bed.
• Keep a fan and a glass of cold water within reach.
• Avoid alcohol, a large meal and hot drinks within three hours of bed.
• If you wake and can't get back to sleep within about 20 minutes, get up, keep the lights low and do something calm until you feel sleepy.
• If you share a bed, consider separate duvets so both of you can regulate temperature.

The Seven-Night Sleep Reset in this library has a full week-long plan and a sleep log.

Treatment options: an overview

There is no single right answer. The best option depends on your symptoms, your health history, your preferences and your timing. Here's the landscape to discuss with your clinician.

1. 1

   Menopausal hormone therapy (MHT or HRT)

   Replacing oestrogen is the most effective treatment for hot flushes and night sweats, and it also helps protect bone. Women with a uterus need progesterone (or a progestogen) as well, to protect the lining of the womb. Major menopause societies have concluded that for most healthy women under 60, or within 10 years of their final period, the benefits outweigh the risks for treating symptoms. In November 2025, the FDA began removing the 'black box' warnings that had been on these products since the early 2000s. Risks still exist and depend on your history, the type of hormone, the dose and the route (patches and gels carry a lower clot risk than tablets), so this is a personal decision made with your clinician.

2. 2

   Vaginal (local) oestrogen

   Low-dose creams, tablets or rings treat dryness, painful sex and some urinary symptoms. Very little is absorbed into the bloodstream.

3. 3

   Non-hormonal prescriptions

   Two drugs that target the brain's temperature-control centre are now FDA-approved for moderate to severe hot flushes: fezolinetant (Veozah, 2023) and elinzanetant (Lynkuet, 2025). Some antidepressants (SSRIs and SNRIs) and gabapentin are also used. These are options for women who can't or prefer not to take hormones.

4. 4

   Lifestyle and behavioural approaches

   Cognitive behavioural therapy (CBT) has good evidence for reducing how much hot flushes bother you and for improving sleep. Layered clothing, a cool bedroom, limiting alcohol and spicy food, and regular exercise help many women.

5. 5

   Supplements and 'bioidentical' compounded products

   Evidence for most herbal supplements is weak or mixed, and quality varies. Compounded hormones aren't regulated in the same way as approved products. Discuss anything you're considering with your clinician, and tell them about everything you take.

Hormone therapy: myths and facts

1. 1

   Myth: hormone therapy causes breast cancer in everyone who takes it

   The picture is more nuanced. The early-2000s Women's Health Initiative findings caused widespread fear, but later analyses showed risk depends heavily on age, timing, the type of hormones and how long they're taken. Oestrogen-only therapy (for women without a uterus) carries a different profile from combined therapy. Your clinician can put the numbers in context for you.

2. 2

   Myth: you have to suffer through it

   Symptoms can last years, and they affect work, relationships and long-term health. There are effective, well-studied treatments, both hormonal and non-hormonal. Wanting relief is not weakness.

3. 3

   Myth: it's too late if you're already past menopause

   Timing matters for systemic hormone therapy, and the benefit-risk balance is generally most favourable when started under 60 or within 10 years of menopause. But it's rarely too late to treat symptoms such as vaginal dryness, and non-hormonal options exist at any age.

4. 4

   Myth: a blood test will tell you if you're in perimenopause

   Hormone levels fluctuate so much in perimenopause that a single test is often unhelpful. For most women over 45, diagnosis is based on symptoms and cycle changes. Tests can be useful in specific situations, such as symptoms under 40, or to rule out other causes.

5. 5

   Myth: 'bioidentical' compounded hormones are safer

   Many FDA-approved hormone products already use body-identical oestradiol and micronised progesterone. Custom-compounded products aren't held to the same standards for dose consistency and safety testing.

Periods and contraception in perimenopause

It's easy to assume pregnancy is no longer possible once periods become irregular, but you can still ovulate, sometimes unpredictably, during perimenopause. Common guidance is to continue contraception until you've gone 12 months without a period if you're over 50, or two years if you're under 50. Check what applies to you with your clinician.

Some forms of contraception, such as a hormonal IUD, can also help with heavy bleeding and can provide the progestogen part of hormone therapy. Heavy or prolonged bleeding is common in perimenopause, but it should always be checked, because it can cause iron deficiency and occasionally signals other problems.

Before your appointment: track for four weeks

Patterns are far more useful to a clinician than memories. A month of notes turns 'I just don't feel right' into specific, actionable information. Rate each item from 0 (none) to 3 (severe), and note anything that seems to trigger symptoms.

How to prepare for your appointment

Questions to bring to your doctor

• Do my symptoms fit perimenopause or menopause, or should we rule out anything else, such as thyroid, iron, blood sugar or sleep apnoea?
• Which tests, if any, are useful for me, and which aren't?
• What are all my options: hormonal, non-hormonal and lifestyle?
• Given my personal and family history, what are the benefits and risks of each option for me specifically?
• If I take hormone therapy, which type, dose and route do you recommend, and why?
• How long would I take it, and how will we decide when to review or stop?
• What can I do now to protect my bones and heart?
• Should I have a bone density scan? When?
• What could help with vaginal dryness or urinary symptoms?
• Which side effects should prompt me to call you?
• If you don't specialise in menopause, can you refer me to someone who does?

If you feel dismissed

Many women report being told their symptoms are 'just stress' or 'just ageing'. You deserve to be taken seriously. If an appointment doesn't go well, you have options.

• Ask directly: 'Could this be perimenopause, and what would you recommend if it is?'
• Bring your four-week tracking sheet. Data is harder to wave away.
• Ask for a referral to a gynaecologist or a menopause specialist.
• In the US, The Menopause Society lists clinicians with menopause certification.
• Get a second opinion. It's a normal and reasonable step.

Daily habits that help at every stage

1. 1

   Strength training, two or three times a week

   It protects muscle and bone, which are both under pressure as oestrogen falls, and helps with mood and sleep.

2. 2

   Protein at every meal

   It supports muscle maintenance. See the Longevity Primer for targets and food ideas.

3. 3

   Protect your sleep

   Keep your bedroom cool, wear breathable layers, keep a fan by the bed, limit alcohol and keep a consistent schedule.

4. 4

   Watch your triggers

   Alcohol, caffeine, spicy food, hot drinks and stress trigger hot flushes for many women. Track yours.

5. 5

   Move every day

   Regular activity supports mood, weight, heart health and sleep.

6. 6

   Stay connected

   Talk to friends going through the same thing. Shared experience reduces the isolation many women feel.

Talking to your partner and family

Hormonal change affects the people around you too, especially through mood, sleep and intimacy. Naming what's happening often brings relief on both sides. You don't need to share everything. A short, direct conversation can go a long way.

• Explain the basics: 'My hormones are changing, and it's affecting my sleep and mood. It's common, it's temporary, and I'm working on it.'
• Be specific about what helps: more space, a cooler bedroom, help with the evening routine, patience on rough days.
• Talk openly about intimacy. Discomfort is treatable, and lower desire is common and worth discussing with your clinician.
• Share this guide if it helps them understand.

At work

Menopause symptoms coincide with the years when many women hold their most senior roles, and plenty quietly struggle. You don't have to disclose anything you don't want to, but small adjustments can make a big difference.

• Control your environment: a desk fan, a seat near a window, breathable layers.
• Protect deep-focus work for the time of day your brain is sharpest.
• Use notes and checklists to offset brain fog. It isn't a weakness. It's good systems.
• If your organisation has a menopause policy or benefits, read it. Many now cover specialist care.
• If you lead a team, normalise the conversation. You may help someone more than you know.

Your first 90 days: an action plan

If you suspect perimenopause, or you've just been told you're in it, here's a simple sequence to follow so you're not trying to fix everything at once.

1. 1

   Weeks 1–4: Observe and track

   Use the four-week tracking table. Don't change much yet. You're building a clear picture of your symptoms, your cycle and your triggers. Note how symptoms affect work, sleep and relationships, because that's what helps a clinician understand their impact.

2. 2

   Week 4–5: Book and prepare

   Book an appointment, ideally a longer one or a menopause-focused visit. Work through the preparation checklist and pick your top three questions. Decide in advance what matters most to you.

3. 3

   Weeks 5–8: Start the foundations

   While you wait for and act on medical advice, start the habits with the strongest evidence: two strength sessions a week, protein at every meal, a cooler bedroom and a consistent sleep schedule, and less alcohol.

4. 4

   Weeks 8–12: Review and adjust

   If you've started a treatment, note what has changed. Most need several weeks to show their full effect. Book a review appointment rather than waiting until things get bad. If something isn't working or the side effects bother you, there are other options to try.

5. 5

   Day 90: Set your long-term rhythm

   Schedule your yearly check-in, your bone and heart checks, and a date to review any treatment. Then use the checklist below each year.

Your hormone health checklist

Use this once a year, or whenever something changes.

Education, not medical advice. Hormone therapy and other treatments have benefits and risks that depend on your personal and family history. Talk to a licensed clinician about your own care.