Menopause: the biology, the stages and when to see a doctor

Deep dive · Menopause at Health Royals · 7 min read

Menopause is not a date in the calendar but a process that runs for years, and almost everything that feels confusing along the way traces back to a single change.

What happens in the body during menopause?

Oestrogen and progesterone influence far more than the reproductive system. They help regulate energy metabolism, brain chemistry, collagen production, inflammation and skin hydration. Oestrogen receptors sit in skin, bone, blood vessels, joints and brain tissue. Oestrogen is not only a reproductive hormone but a signalling molecule that many tissues have come to rely on.

When levels fall, all of those tissues adjust at roughly the same time. Skin, joints, sleep, energy and mood are not five separate problems but five expressions of one change. This article follows the biology stage by stage; the whole picture is gathered in our menopause need guide.

Menopause is not a fault in the body but a recalibration of a signal that nearly every tissue has come to depend on.

What is perimenopause, and when does it start?

Perimenopause is the stage when hormone levels start to vary, before periods have stopped. The distinction matters: oestrogen does not decline smoothly, it swings, sometimes sharply and unpredictably from one cycle to the next.

That is why this stage is often the most disorienting. Cycles become shorter, longer, heavier or further apart, sleep becomes lighter, skin drier. Because periods are still there, the changes are frequently not connected to menopause at all, and the earliest signs show up in sleep, skin and energy rather than in the cycle.

Perimenopause is defined by fluctuating hormone levels rather than low ones, which is exactly why it feels unpredictable.

At what age does menopause start, and how long does it last?

The transition usually begins several years before periods stop, most often somewhere in the forties, though the range is wide. Menopause in the strict sense is not a period of time but a single point, established in retrospect once twelve months have passed without a period. How long symptoms last varies enormously, and there is no normal duration to measure yourself against.

Menopause is a point calculated in hindsight, while the transition is the whole process around it.

Which symptoms are common in menopause?

The list is long, and that is the point: when a signal used by many tissues changes, the expressions are many:

• Drier, thinner skin and reduced elasticity
• A loss of firmness or glow
• Slower recovery from exercise or fatigue
• Joint stiffness or reduced mobility
• Shifts in mood or focus
• A feeling of being out of sync with one's former rhythm

Listed that way it sounds like six problems. Biologically it is closer to one.

The symptoms feel unrelated because we experience them separately, but the mechanism underneath is shared.

Why does skin get dry during menopause?

Skin is one of the most oestrogen-sensitive tissues. Collagen synthesis slows, which affects firmness and structure. Hyaluronic acid levels fall, the molecule that builds the water-rich environment around skin cells. At the same time the lipid barrier becomes less efficient at holding water in. Three measurable changes sit behind this:

• Reduced activity in the skin's fibroblasts, the cells that make collagen
• Lower water content in the dermis
• Shifts in skin pH and in the barrier's lipid balance

The result is skin that is drier, thinner and more fragile, not only on the face but across mucosal and connective tissues. More on the biology of hydration in our article on skin health from within.

Dry skin in menopause is a question of structure and barrier, not of having stopped looking after your skin.

Why do joints ache and feel stiff?

Oestrogen helps maintain the elasticity of connective tissue and influences the production of glycosaminoglycans, the family of molecules that includes hyaluronic acid and chondroitin sulfate. Both are central components of cartilage and joint fluid. As oestrogen falls these molecules shift, which is often felt as morning stiffness, reduced flexibility and mild discomfort with movement.

Hyaluronic acid retains moisture within the joint matrix and supports lubrication and cushioning, so when levels fall joints can feel drier and less supported. Collagen turnover also slows, affecting tendons, ligaments and cartilage. These are signals of recalibration, not of damage. A plausible mechanism is not a treatment, though, and there is no authorised EU health claim for hyaluronic acid or collagen in relation to joints.

Stiffness that comes and goes with the morning is common in midlife, but persistent joint pain is a medical question.

Why does energy fade and sleep get lighter?

Fatigue is the most common and most misunderstood midlife complaint. Part of the explanation is sleep, which becomes lighter. Part of it sits deeper. As hormone levels fall, mitochondrial efficiency drops, the cellular power plants that produce energy. In practice that means:

• Increased oxidative stress
• Reduced output of ATP, the body's cellular energy currency
• Slower recovery at the cellular level

Brain chemistry shifts in parallel. Oestrogen influences serotonin, dopamine and acetylcholine, the neurotransmitters behind mood, memory and learning. Brain fog, low motivation and heightened sensitivity to stress are therefore not imagined but real neurobiological transitions. On sleep and recovery we have written separately about stress, sleep and the path back to balance.

Midlife fatigue has a cellular component and is not only a matter of how many hours you slept.

Why do weight and blood sugar change in midlife?

Menopause also brings changes in glucose regulation and body composition. Insulin sensitivity often declines, which can contribute to central weight gain, increased cravings and afternoon energy dips. This is not a loss of discipline but a sign that the body stores and uses energy differently. The same logic across the lifespan is described in our article on healthy ageing.

A changed body composition in midlife reflects a shift in insulin sensitivity, not weaker willpower.

When should you see a doctor about menopause symptoms?

Midlife is also a period when other conditions become more common, and symptoms should not automatically be filed under hormones. Contact a doctor about bleeding that returns after periods have stopped, heavy or prolonged bleeding, persistent joint pain, low mood or anxiety that does not lift, and symptoms that dictate your day. Hormone therapy is a medical decision made with a doctor. Bone health belongs here too, because the years around menopause are the period of most rapid change in bone density across a woman's life.

Bleeding after periods have stopped should always be assessed by a doctor, however light it is.

Where do diet and supplements fit in?

A food supplement does not treat menopause, does not relieve its symptoms, and does not replace hormones, a varied diet, sleep, movement or medical care. What can be said is how individual nutrients are regulated. Vitamin D3 contributes to the maintenance of normal bones and normal muscle function. Vitamin K2 contributes to the maintenance of normal bones. Vitamin C contributes to normal collagen formation for the normal function of skin. Those statements describe the roles of nutrients, not menopause. Which nutrients belong to which system, and at what amounts, is set out in the need guide.

Read the menopause need guide

Go deeper

• Menopause and midlife: what changes in the body
• Skin health: the living foundation of beauty
• Stress and sleep: restoring balance and resilience
• The science of longevity and living well
• Oral hyaluronic acid for skin
• Vitamin D3 for muscles and bones
• After calcium is absorbed: the role of vitamin K2

Frequently asked questions

Are perimenopause and menopause the same thing?
No. Perimenopause is the stage when levels fluctuate but periods continue. Menopause is the point at which they have been absent for twelve months.

Do I need a blood test to know it is menopause?
The assessment is usually based on age and the pattern of symptoms rather than a single hormone test, because levels swing widely during perimenopause.

Is joint pain really connected to menopause?
Stiffness and reduced mobility are common at this stage and have a described mechanism through connective tissue and glycosaminoglycans. Several other conditions cause similar complaints, so persistent joint pain should be assessed by a doctor.

Can a supplement relieve hot flushes?
We make no such claim. There is no authorised EU health claim for our ingredients in relation to vasomotor symptoms. Treatment for hot flushes is a medical matter.

How long before a supplement makes a difference?
Twelve weeks is the shortest sensible period to judge by, because skin and hair change on the timescale of their own renewal cycles.

Sources

1. Santoro N, Epperson CN, Mathews SB. Menopausal symptoms and their management. Endocrinol Metab Clin North Am. 2015;44(3):497–515.
2. Baumann L. Skin ageing and menopause – implications for treatment. Am J Clin Dermatol. 2007;8(6):371–378.
3. Verdier-Sévrain S, Bonté F. Skin hydration: A review on its molecular mechanisms. J Cosmet Dermatol. 2007;6(2):75–82.
4. Yao J, et al. Mitochondrial bioenergetic deficit precedes Alzheimer's pathology in female mouse model of menopause. J Alzheimers Dis. 2009;17(3):641–656.
5. Salminen H, et al. Women, menopause and osteoarthritis: The role of estrogens. Mol Cell Endocrinol. 2001;179(1-2):435–441.
6. Maki PM, et al. Hormone therapy and cognition: The Women's Health Initiative Memory Study. JAMA. 2003;289(20):2663–2672.
7. Carr MC. The emergence of the metabolic syndrome with menopause. J Clin Endocrinol Metab. 2003;88(6):2404–2411.

Important information

This article is general information and educational reading. It is not medical advice, and it does not diagnose, treat, cure or prevent any condition, including menopause or any of its symptoms. Food supplements are not a substitute for a varied diet and a balanced lifestyle. Decisions about hormone therapy or any other treatment should be made with a qualified healthcare professional. If you are pregnant, breastfeeding, taking medication or have a medical condition, speak to your doctor before taking a supplement.