How hormonal balance changes in women as they age

In clinical practice, it is common to encounter situations where women aged 40–45 experience changes that cannot be explained solely by external factors. Sudden irritability, insomnia at three in the morning and weight gain without a change in diet are not the result of a lack of willpower, but a classic scenario of endocrine system restructuring.

A woman’s hormonal system is not a static set of indicators, but a dynamic process. Understanding these mechanisms helps to support the body’s resources in good time and avoid complications.

Causes of hormonal imbalance in women

The following play a key role in the female endocrine system:

Oestrogens (oestradiol): responsible for bone density, vascular elasticity and cognitive function.
Progesterone: the ‘calming hormone’, which supports the second phase of the cycle and psycho-emotional stability.
FSH and LH: pituitary hormones that regulate ovarian function.
Prolactin and thyroid hormones (TSH, T4): control metabolism and stress adaptation.

The levels of these hormones depend directly on ovarian reserve – the supply of eggs established before birth. According to data from the World Health Organisation (WHO), the number of follicles begins to decline significantly after the age of 35–37. This is a natural process of biological wear and tear, but modern lifestyles (lack of sleep, excessive sugar intake) can accelerate this decline.

Hormonal changes at different stages of life

Adolescence and the development of the reproductive system

Puberty is the stage during which the connection between the cerebral cortex and the ovaries is established. In the first two years after the onset of menstruation, the cycle is often irregular. Experts caution against the hasty prescription of hormonal contraceptives at this age without clear medical indications: the system needs time to establish its own rhythm. Emotional outbursts and skin problems during this period are the result of a temporary imbalance between oestrogens and androgens.

The reproductive period and the impact of stress

This is the period of maximum stability for the system. However, it is precisely here that the risk of chronic stress affecting the hormonal axis arises. During prolonged stress, the body redirects resources towards cortisol production. As cortisol and progesterone share a common biochemical precursor (pregnenolone), a mechanism of resource reallocation occurs, known as the ‘progesterone-stealing phenomenon’. The reproductive system finds itself deficient, which manifests as severe PMS, cycle irregularities and problems with conception, even with normal baseline test results.

Characteristics of changes after the age of 35

After the age of 35, the changes become more specific. At this age, a gradual decline in progesterone levels begins, whilst oestrogen levels remain relatively stable.

Clinical manifestations:

shortening of the cycle length (e.g., from 28 to 24 days);
the appearance of oedema in the second phase;
increased sensitivity to external stimuli.

A lack of adequate support during this period often leads to the development of oestrogen dominance, which by the age of 40 may progress to endometrial hyperplasia or neoplasms.

Perimenopause: signs and the onset of change

The term perimenopause (from the Greek ‘peri’ – around, near) refers to the transitional period in a woman’s life that precedes menopause. This stage usually begins between the ages of 40 and 45 and is characterised by instability in ovarian function. The functioning of the endocrine glands becomes intermittent, leading to sharp fluctuations in oestradiol levels.

Key indicators:

Night sweats: episodes of sudden hot flushes during sleep.
Cognitive difficulties: reduced concentration and memory caused by fluctuations in oestrogen levels in the brain.
Anxiety: the onset of unexplained anxiety, caused by changes in the sensitivity of GABA receptors.

Timely support for the vascular system and correction of iron, magnesium and vitamin D deficiencies at this stage help to minimise future health risks.

Menopause: systemic effects on a woman’s body

Menopause is confirmed after 12 months without menstruation. The average age of onset is 51–52 years. A sustained drop in oestrogen levels triggers a cascade of systemic changes:

Vasomotor symptoms: hot flushes are experienced by 80% of women.
Metabolic shifts: there is a redistribution of adipose tissue to the abdominal region. This is the body’s compensatory attempt to make up for the oestrogen deficiency by utilising visceral fat, which increases the risk of insulin resistance and type 2 diabetes.
Skeletal system: studies published in PubMed confirm that during the first five years of the menopause, due to a lack of oestradiol, a woman may lose up to 10–20% of her bone mass.

The impact of hormonal fluctuations on psychological and emotional well-being

Oestrogens act as natural modulators of serotonin levels. When oestrogen levels fall, the threshold for stress tolerance decreases. It is important to understand that emotional breakdowns during this period have a clear neurobiological basis. According to clinical protocols, competent menopausal hormone therapy (MHT) or herbal support often restores psychological and emotional well-being more effectively than psychotherapeutic methods alone.

The role of lifestyle in maintaining endocrine health

The endocrine system is highly sensitive to external factors:

Excess weight: adipose tissue functions as an active endocrine organ, producing excess forms of oestrogen, which increases the risk of cancer.
Sleep: melatonin production is directly linked to the balance of sex hormones. Chronic insomnia prevents the hormonal balance from fully recovering.
Diet: a protein deficiency leads to a lack of transport systems for hormones, which can mimic a severe deficiency of these hormones in the tissues.

When to consult a gynaecologist-endocrinologist

A medical examination is recommended if the following symptoms appear:

Irregular periods (variations of more than 7 days in either direction).
Severe sleep disturbances and night sweats.
Rapid weight gain whilst maintaining your usual diet and exercise routine.
Decreased libido and clinical dryness of the mucous membranes.
Constant fatigue (anaemia and hypothyroidism, which often accompany hormonal decline, must be ruled out).

Menopausal hormone therapy (MHT): what you need to know

Modern MHT involves the use of microdoses of preparations that are bioidentical to natural hormones.

Key principles:

Therapeutic window: therapy is safest and most effective if started within the first 10 years of the menopause.
Mandatory check-up: prior to prescription, a mammogram, expert-grade ultrasound, coagulogram and liver function assessment are carried out.
Individualised approach: self-medication is prohibited due to the high risk of thromboembolic complications if the medication is incorrectly selected.

Conclusion and expert recommendations

Age-related hormonal changes are a natural transition of the body to a new level of functioning, not a pathological condition. The aim of modern medicine is to make this transition as smooth as possible, preserving bone density, cognitive abilities and cardiovascular health. Success depends on a combination of lifestyle discipline and regular medical monitoring.

FAQ: Frequently asked questions

Is it possible to delay the onset of the menopause?

It is not possible to increase your genetically determined egg reserve. However, giving up smoking and managing stress can help prevent premature ovarian depletion. Smoking accelerates the onset of the menopause by an average of 2 years.

Does hormone therapy lead to weight gain?

It has been clinically proven that modern HRT helps stabilise metabolism and aids weight maintenance, preventing the development of visceral obesity.

Can dietary supplements replace proper treatment?

Herbal preparations (phytoestrogens) can alleviate subjective symptoms such as hot flushes, but there is insufficient evidence to support their use in preventing osteoporosis and cardiovascular disease.

Should you see a doctor if you don’t have hot flushes?

Yes. Hormone deficiency can be asymptomatic, silently affecting blood lipid profiles and bone density. After the age of 45, regular monitoring of FSH levels and ultrasound scans is essential for every woman.

How long can hormone replacement therapy be taken?

The duration of treatment is determined on an individual basis. According to current international guidelines, therapy may continue as long as the benefits outweigh the potential risks, provided annual check-ups are carried out.

How does stress affect the age at which the menopause begins?

Prolonged psychological and emotional stress disrupts the functioning of the hypothalamic-pituitary axis, which can trigger ovarian insufficiency and an earlier cessation of menstruation.