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Oestrogen is not just a reproductive hormone. It affects your brain, bones, cardiovascular system, skin, joints, and mood. When it starts to fluctuate — and fluctuation is the key word in perimenopause — the whole body notices.

Progesterone declines earlier and more steeply than oestrogen in many women. It is the hormone most associated with calm and sleep quality, which is why sleep is often the first casualty of perimenopause.

The transition is not linear. Oestrogen can spike unpredictably high before falling, which is why some women experience symptoms of both oestrogen excess (breast tenderness, bloating) and oestrogen deficiency (hot flushes, dryness) at different times — or even simultaneously.

As ovulation becomes less predictable, the menstrual cycle loses its regularity. Cycles may shorten to 21 days or extend past 45. Periods may become lighter and shorter, or dramatically heavier with clotting.

Heavy periods are very common in perimenopause and can lead to iron deficiency and exhaustion. A period that requires changing a pad or tampon every hour for two or more consecutive hours, or that contains large clots, warrants a GP visit.

Bleeding between periods, after sex, or after 12 months of no periods should always be discussed with your GP — these symptoms need to be evaluated, not assumed to be perimenopause.

Oestrogen influences the production and metabolism of serotonin, dopamine, and GABA — the brain chemicals that regulate mood, calm, and pleasure. When oestrogen fluctuates, these systems are destabilised.

This is why perimenopause can bring on anxiety, low mood, or emotional reactivity in women who have never experienced these things before. It is biological, not a character flaw.

The perimenopausal rage many women describe — a sudden, disproportionate response to things that previously did not bother them — is a recognised phenomenon linked to hormonal volatility and sleep deprivation. If low mood persists for more than two weeks, please speak to your GP. Perimenopause is associated with increased risk of depression, and there are effective treatments available.

Progesterone has a sedative quality — it helps you reach deep sleep. As it declines in perimenopause, many women begin waking at 3am or find it hard to reach deep, restorative sleep, even before other symptoms appear.

Add night sweats to the mix and you have a perfect storm. The chronic sleep deprivation that results compounds every other symptom: it worsens brain fog, mood instability, fatigue, and metabolic function.

Evidence-based sleep strategies that help: consistent wake time (even on weekends), keeping your bedroom below 18°C, no alcohol within 3 hours of bed, limiting caffeine after 2pm, and not lying awake in bed for more than 20 minutes. If sleep disruption is severe, your GP can discuss options including addressing night sweats directly.

Strength training 2–3 times per week is one of the most powerful tools in perimenopause — it helps preserve muscle mass, support bone density, regulate mood, improve sleep, and manage weight. Cardiovascular exercise supports heart health. Yoga and pilates can help with stress and pelvic floor function.

Nutrition shifts matter: protein becomes more important for muscle maintenance, and many women find that refined carbohydrates and alcohol amplify symptoms. Phytoestrogens (found in soy, flaxseed, legumes) may help some women with mild symptoms — evidence is mixed, but they are safe to include.

Alcohol is worth an honest look. It fragments sleep, triggers hot flushes, and contributes to anxiety and low mood — three areas already under pressure in perimenopause. Even 2–3 drinks a week can have a measurable impact on symptom burden for some women.

Many GPs are knowledgeable about perimenopause — but many women still report being dismissed or undertreated. Being informed and specific about your symptoms makes a significant difference. Come prepared with a written list.

MHT (Menopausal Hormone Therapy — the current Australian term for HRT) has undergone a major rehabilitation in the evidence base since the 2002 WHI study. For most healthy women under 60 and within 10 years of menopause, current evidence suggests benefits outweigh risks. Your GP can advise based on your individual health profile.

Under Medicare, GPs can claim a specific item number for perimenopause and menopause management consultations. It is worth asking whether this applies to your appointment. The Australasian Menopause Society (ams.asn.au) also has a Find a Doctor tool for locating GPs with specific menopause training.