What really happens to your body during the menopause transition?

If you’ve ever looked in the mirror and thought…

“Why does my body feel like it’s running a completely different operating system?”

You are not imagining it.

One of the most empowering shifts a woman can make in her 40s, 50s and beyond is this:

✅ Stop blaming yourself

✅ Stop thinking it’s “just ageing”

✅ Start understanding what’s actually happening inside your body

Because knowledge doesn’t just give you answers.It gives you options.

This is why all my courses and coaching have a focus on education, so that women begin to understand what is happening in their body - then we work with this understanding to support the body into balance. 

Is menopause ringing alarm bells?

So let’s begin with the physiology of menopause.

Physiology is the study of how the body works and how different systems interact. Knowledge of physiology helps to inform us why symptoms show up. 

Menopause is when fertility and menstruation cease permanently. 

This is not something which happens over night, but rather it’s a slow decline over 10 or so years. 

And it’s not just about the ovaries slowly “retiring.” It’s also about what happens everywhere else when the reproductive hormones decrease.

Menopause is often spoken about like it’s only a reproductive milestone, but the truth is estrogen is not just a fertility hormone!

Estrogen is a major regulatory hormone that influences many systems across the body, including:

• Bone density

• Brain function and mood

• Cholesterol and cardiovascular health

• Electrolyte balance (fluid retention, bloating)

• Skin physiology

• The central nervous system

• Female reproductive organs 

  
  

So when estrogen declines, the whole body is adapting to a new internal environment. Although it happens over a period of a few years - the change is significant. The amount of estrogen in the body after menopause is less than 10% of what it was in your reproductive prime.

That is not a small change, and your body feels it.

This is why so many women experience symptoms that seem unrelated or random:

• Fatigue

• Anxiety

• Restless sleep

• Hot flushes

• Mood changes

• Stubborn weight gain

• Brain fog

• Joint aches

• Muscle loss

• Heart palpitations

• Libido shifts

• Bloating

  
  

It’s all connected.

Your endocrine system -  the “hormone communication network”

Hormones are produced by glands in the endocrine system. These glands release hormones directly into the bloodstream, which then act as chemical messengers telling different organs what to do.

This means that when one hormone changes, the body responds by adjusting other hormones to compensate. So when reproductive hormones fall, it doesn’t happen in isolation, it creates a ripple effect across your whole system.

For this reason, menopause isn't just about estrogen decline - it’s about other hormones, and therefore other body systems too. 

The hypothalamus: why menopause affects sleep, appetite and temperature

One of the most important players here is the hypothalamus (in the brain).

The hypothalamus helps regulate things like:

• sleep cycles

• appetite

• body temperature

• hormone signalling

This is why midlife women often tell me

“I’m doing everything the same, but my sleep is worse, I’m hungrier, and I’m overheating for no reason.”

There is a reason. It’s physiology.

The ripple effects of ageing and hormonal shifts (system by system)

The hypothalamus is the main link between the nervous system and the endocrine system. This means it gets messages from the body about the current conditions, and then signals to the pituitary gland, the “master” gland, which tells all the other glands what to do. 

The pituitary gland and circadian rhythm disruption

The pituitary gland helps regulate many other hormones in the body.

Research shows that ageing can alter pituitary hormone patterns, and these changes are influenced by things like:

• stress

• illness

• medication

• body composition

• exercise levels

• immune function

• neurocognitive changes

One major outcome of this is circadian rhythm disruption - which explains why sleep can become more fragile in midlife.

The cardiovascular system

As women move through menopause, we often see shifts such as:

• vascular stiffness

• increased LDL cholesterol

• increased triglycerides

• lower cardiac output

  
  

This doesn’t mean your heart is “failing.” It means your body is recalibrating, and it needs support. This is one reason I’m so passionate about women learning menopause before it hits hard. Because prevention and early support changes everything.

The nervous system 

Ageing can affect the nervous system too, including:

• increased irritability

• changes in the myelin sheath (the “insulation” around nerves)

• thickening of nerves

When you pair nervous system changes with fluctuating hormones, increased stress, poor sleep, and life pressures, there’s wonder so many women feel like their nervous system is “on edge” all the time.

This is why calming practices aren’t woo, they are physiological support.

Musculo-skeletal and lymphatic changes

This is a big one for women 40+.

Ageing is a major risk factor for:

• loss of muscle mass and function

• lower bone mass and strength

• increased risk of falls and fractures

  
  

And symptoms that may show up include:

• joint pain

• bloating and water retention

• sarcopenia (loss of muscle)

• osteoporosis

• fractures

  
  

This is why I talk about strength, protein, minerals, movement, and recovery as non-negotiables in midlife wellness. It's not just for looking and feeling good today, but to protect your future.

Thyroid shifts

One common pattern seen with ageing is subclinical hypothyroidism, where:

• free thyroxine (FT4) remains normal

• TSH rises

  
  

This can look like:

• sluggishness

• weight changes

• low mood

• feeling cold

• hair or skin changes

• fatigue

  
  

The takeaway is not “something is wrong with you.” The takeaway is check in with your body and support the system early.

Adrenals and stress hormones

Ageing can also be associated with:

• increased cortisol secretion

• elevated stress response

If you feel like your stress tolerance has dropped, or your nervous system stays switched on, this may be part of the picture. Midlife is not the time to “push harder” , it’s the time to get smarter.

Lungs and respiratory capacity

In women, ageing can be associated with:

• lower lung capacity and volume

• increased respiratory rate

• loss of elasticity

Which can influence exercise tolerance and the feeling of getting puffed more easily.

Again, knowledge is an opportunity. Don’t let this stop you from doing things that exercise your lungs, but rather see it as a sign that you must.

Why this all matters

An ageing endocrine system can be associated with changes like:

• reduced protein synthesis

• decreased lean body mass and bone mass

• increased fat mass

• increased insulin resistance risk

• higher cardiovascular disease risk

• increased vasomotor symptoms (hot flushes, night sweats)

• fatigue

• depression

• anaemia

• poor libido

• decline in immune function

When women understand this, something powerful happens:

They stop making it personal. They stop thinking, “I’m lazy, I’m broken, I’m failing.”

And they start thinking: “My body is communicating. I just need to learn the language.”

The empowering truth about menopause

Menopause is not the end of your vitality - it is a turning point and an opportunity for reinvention.

It’s the stage of life where your body stops tolerating what it used to “put up with.”

Less sleep. More stress. Skipping meals. Under-eating protein. Overtraining. Living on caffeine. Ignoring recovery. Trying to “be fine.”

Your body becomes more honest - and this is great, because it becomes an invitation to build a life that actually supports YOU.

A gentle reminder (especially if you’re overwhelmed)

If reading all of this makes you think…

“Oh my gosh, there’s so much going on.”

You’re right. There is. 

To add to this, like you needed more, your declining hormones are also contributing to that overwhelm - their decline also contributes to a drop in your “happy chemicals” such as dopamine, serotonin, oxytocin and GABA

But here’s the good news:

You don’t need to fix everything at once.You just need to stop guessing.

You need to stop throwing all the drugs, herbs and supplements at it, in the hope that you’ll get your “old self” back. This is the time to become your “new self”.

Your next step is simply to learn what your body needs now.

And it's a step that’s definitely worth your time and effort - because how well you take care of yourself in menopause has a big impact on how well you live in your old age. 

Where to begin? 

If you had to choose one place to start, I’d say start with sleep. 

It can be a tricky place to start, but really, if you get this foundation right, everything else becomes easier. 

If you are currently exercising a lot to try to manage your weight, but you are not sleeping well, you could be adding to your problem as you are exercising more than you are recovering. When your body has so much work to deal with all the other changes, being in deficit every day is going to set you backwards.

One of the best ways to reset your sleep rhythm is to get out into the morning light. 

So if you commit to working on sleep and getting out for a walk in the morning light, I think you would make some good progress.

I have a webinar “Making Friends with Sleep in Peri to Post Menopause” which I run regularly - join my mailing list to hear about upcoming event. 

Boost your “happy chemicals” 

You are designed to feel good. Your body is capable of making many neurochemicals that make you happy, but these mechanisms are underused in our modern lifestyles, and can decline during the menopause transition. 

The good news is that there are simple and enjoyable ways to support your body to make more. My video Your Body’s Natural Happy Drugs and How to Activate Them gives you a great insight into how you can literally create your own Bliss Molecules.

I also have a PDF Download - print it and stick on your fridge as a reminder to get your body making more of these wonderful feel good molecules.

Want support through this transition?

If you’re in the stage of life where things feel “off” but you’re not sure why, I’d love to help.

Book a free call and let’s talk about what your body is asking for, and what a supportive path forward could look like.

You deserve to feel good again. And yes, it’s possible!. 

It doesn’t have to be all down hill from here - your body is preparing for a new high.