What low oestrogen does to the body

Why oestrogen falls

Low oestrogen can happen at various life stages for various reasons. Knowing the context helps make sense of the symptoms.

Menopause

The most common cause of low oestrogen. Ovarian function declines through perimenopause and effectively stops at menopause. Small amounts of oestrogen continue to be produced from fat tissue and adrenal sources but levels are a fraction of reproductive year levels. This is a normal physiological transition affecting all women who reach menopause.

Premature ovarian insufficiency

When ovaries stop functioning before age 40. Affects roughly 1 in 100 women. Causes include autoimmune conditions, genetic factors, cancer treatments and sometimes unknown reasons. The hormone deficiency is the same as in menopause but the long term implications are different because the woman has more years of low oestrogen ahead. POI typically warrants hormone replacement.

Breastfeeding

Breastfeeding suppresses oestrogen production. The longer you breastfeed exclusively, the lower oestrogen stays. Symptoms can include vaginal dryness, hot flushes, mood changes and reduced libido, all overlapping with menopausal symptoms. The low oestrogen state is temporary and reverses once breastfeeding reduces or stops.

Other causes

Severe stress, very low body weight, excessive exercise without adequate fuelling and certain medications can suppress oestrogen production. The mechanism involves hypothalamic suppression of the whole reproductive hormonal cascade. The condition is called functional hypothalamic amenorrhoea when periods stop. Treatment involves addressing the underlying cause.

What most people know about

Some effects of low oestrogen are well known. These tend to dominate the cultural conversation about menopause.

Hot flushes and night sweats

The thermoregulation centre in the brain becomes more sensitive to small temperature changes when oestrogen is low. Tiny shifts trigger full cooling responses (flushes and sweats). Affects around 75 percent of women through menopause. Can persist for years. Severely affects sleep when night sweats are prominent.

Vaginal and urinary changes

Low oestrogen causes vaginal tissues to thin and produce less lubrication. Symptoms include dryness, discomfort, painful sex and frequent urinary tract infections. The urinary changes are sometimes called genitourinary syndrome of menopause. Local vaginal oestrogen typically resolves these symptoms directly.

Mood and brain symptoms

Low oestrogen affects neurotransmitters including serotonin. The result includes mood changes, anxiety, brain fog, difficulty concentrating, word finding problems and memory lapses. These symptoms can be alarming because they feel cognitive but typically improve in the years after menopause as the brain adapts to the new hormonal environment.

Sleep disruption

Sleep is affected by direct hormonal effects on sleep regulation, night sweats waking you up and anxiety affecting your ability to fall and stay asleep. The cumulative effect of disturbed sleep over months or years contributes to many other symptoms. Improving sleep helps almost everything else.

What people often do not know

Low oestrogen produces effects beyond the classic symptoms. Many women do not realise these problems are hormone related.

Joint and muscle aches

Many women develop new joint and muscle aches around menopause. The pattern can mimic arthritis. Oestrogen has effects on connective tissue, joints and muscles that disappear with the hormone. Stiffness in the morning, aching shoulders, hips and knees are common. HRT often helps these symptoms substantially. Speak to your GP if joint pain is significant.

Frozen shoulder

Frozen shoulder (adhesive capsulitis) is significantly more common in women around menopause. The connection between low oestrogen and frozen shoulder is now well recognised. The condition produces shoulder stiffness and pain that can last 6 to 24 months. Physiotherapy and sometimes injections help. HRT may help prevent or improve the condition.

Skin and hair changes

Skin thins and becomes drier. Hair on the head may thin. Body hair patterns may change. Some women experience itchy skin or sensations like insects crawling (formication). These are real hormone related changes. Topical and systemic treatments help to varying degrees. HRT can improve skin and hair changes.

Bone density and metabolic health

Bone density loss accelerates significantly when oestrogen falls at menopause. Cholesterol patterns shift, insulin sensitivity drops and body composition changes. The cardiovascular risk profile becomes more concerning. These changes are gradual but have substantial long term implications. Active management helps.

Addressing low oestrogen

Several approaches can address low oestrogen effects. The right approach depends on the cause, severity and individual circumstances.

HRT for menopause

Hormone replacement therapy addresses the underlying issue by replacing the oestrogen that has declined. Most low oestrogen symptoms respond well to HRT, often within weeks. UK guidance has moved toward earlier and more accessible prescribing. Modern HRT typically uses body identical hormones delivered through the skin. Speak to your GP.

Local treatment for vaginal symptoms

Local vaginal oestrogen (creams, tablets or rings) treats vaginal and urinary symptoms directly with minimal systemic absorption. Suitable for almost all women including many who cannot take systemic HRT. Often life changing for women with vaginal atrophy. Can be used alongside systemic HRT or alone.

For premature ovarian insufficiency

Women with POI typically need hormone replacement until at least the average age of natural menopause (51) to protect long term health. The treatment may be combined HRT or the combined contraceptive pill. Speak to a GP or specialist about appropriate management of POI.

When the cause is reversible

For low oestrogen from severe stress, low body weight or excessive exercise, addressing the underlying cause is essential. More food, less training and stress reduction can restore normal hormonal function over months. Some women in these situations also need short term hormonal support. Speak to your GP about your individual situation.

More on female health

For the underlying hormone, our Oestrogen: What It Does and Why It Matters covers oestrogen itself. Menopause: A Complete Guide covers the life stage where low oestrogen typically begins. And Hormone Replacement Therapy: A Complete Guide covers the main treatment for low oestrogen.