Congratulations on Remaining Calm. Some of Us Have Oestrogen.

Quick summary (get the gist in 60 seconds)

• It’s biology, not a character flaw: Perimenopause brings marked shifts in mood, irritability, anxiety, and stress tolerance.¹˒²

• The real hormonal driver: Research suggests erratic fluctuations in oestrogen, rather than a gradual decline, make the brain far more vulnerable to daily stress.³

• The cost of performing calm:  Habitually hiding your feelings has been linked to fewer positive emotions and poorer memory.⁷˒⁸

• Action step: Unpack whether your shifting stress threshold is hormonal by taking our 60-Second Perimenopause Quiz.
  

Still with us? Good, because this gets interesting.

Stoicism is currently having an enthusiastic revival in parts of the modern "bro-sphere." Podcasts and influencers preach discipline, emotional suppression, and the virtue of remaining completely unaffected as the ultimate antidote to life's chaos.

Women might be forgiven for finding this mildly amusing.

We have spent decades being told to stay agreeable, keep emotions out of the boardroom, avoid making a fuss, and maintain unshakeable composure. Then perimenopause arrives, recalibrates our neurochemical baseline, and culture expects the exact same performance.

If you have recently noticed a hair-trigger temper, unprovoked anxiety, or a rapidly shrinking tolerance for everyday nonsense, you are not alone. And more importantly: you are not losing your mind.

Can perimenopause cause anxiety, low mood, and irritability?

Yes. Perimenopause, the transitional phase leading up to your final menstrual cycle, is clinically recognised by menopause specialists as a window of heightened vulnerability to psychological symptoms, including sudden anxiety, irritability, brain fog, and uncharacteristic rage.¹˒²

According to women’s health organisation Jean Hailes, psychological shifts such as anxiety, low mood or brain fog can be among the first signs of perimenopause, often appearing from around age 45.² And while perimenopause can begin earlier for some women, the bigger point is that the first clue is not always the one we have been taught to look for.

A UK study of 978 women makes that particularly clear. The five most commonly reported symptoms were:

1. Feeling tired or lacking in energy - 96%

2. Memory problems - 93%

3. Difficulty concentrating - 91%

4. Irritability - 90%

5. Feeling tense or nervous - 90%

Night sweats came in at 14th.

Hot flushes came in at 18th.⁴

Which is quite a plot twist, considering one of the ads in Australia's first national perimenopause and menopause awareness campaign, 'Could This Be Perimenopause?', still opens on the classic hot flush moment: 'First, you're on fire.'⁵

That is not to say hot flushes do not matter. They absolutely do. It is just a useful reminder that the symptoms getting the most airtime are not always the ones women notice first, or the ones affecting them most.

Does perimenopause start in your 30s?

Yes. Biology rarely respects neat, round decade brackets. Perimenopause can begin in a woman’s late 30s or early 40s.

When symptoms start early, women frequently dismiss them as chronic stress, professional burnout, poor sleep hygiene, or simply failing to cope. If your emotional buffer has quietly evaporated, your age should not exclude perimenopause from the medical conversation.

Why oestrogen fluctuations impact mood and stress

Oestrogen isn't only a reproductive hormone. It also acts in the brain, including on serotonin, a chemical messenger that helps regulate mood.⁶

During perimenopause, oestrogen does not decline on a smooth, gradual trajectory. Instead, it swings wildly, surging and dropping unpredictably from week to week.

A clinical pilot study led by Dr. Jennifer Gordon revealed that larger week-to-week estradiol (oestrogen) fluctuations were significantly associated with increased depressive symptoms and higher sensitivity to everyday stress.³ The study also noted that women with a history of significant past life stress may be more physiologically vulnerable to these hormonal shifts.³

The "Same Tuesday, Different Brain" Reality

In everyday terms: the commute hasn’t changed, the workload hasn’t changed, and your teenager’s dramatic sighs are no louder than they were six months ago. What has changed is your neurochemical shock absorber.

Hormones do not explain every bad day. Juggling an unmanageable mental load, disrupted sleep, career demands, teenage crises, and ageing parents creates plenty of friction on its own.¹ But you no longer have to pretend oestrogen plays no role in the equation.

The Hidden Cost of Performing Composure ("Expressive Suppression")

Society treats emotional detachment as a badge of honour. We praise women who are "unflappable" and dismiss those who show natural frustration.

In psychology, the deliberate effort to mask outward emotional displays is termed expressive suppression. Research shows that forcing a calm exterior is far from neutral:

• Diminished positive affect: Fewer good feelings: people who habitually suppress their emotions tend to experience fewer positive emotions and more negative ones.⁷

• Cognitive depletion: Less memory to spare: in one experiment, people asked to keep a straight face while viewing upsetting images remembered less of what they saw.⁸

• Physiological impact on others:  It affects the people around you: when women were asked to hide their feelings during an upsetting conversation, the conversation got harder and their partners' blood pressure rose more.⁹ Looking composed takes effort, and other people can feel it.

When you sit through a tense meeting managing brain fog, sleep deprivation, and fluctuating hormones while acting perfectly serene, you are doing double duty. The calm everyone else admires comes at a steep cognitive and emotional price.

The double bind: anger at work

The societal pressure to stay calm is not just exhausting; it exposes a structural double standard.

Seminal research from Yale University explored status conferral in the workplace:

• Men who expressed anger during high-pressure situations were awarded higher professional status and perceived as competent leaders.¹⁰

• Women who expressed the exact same anger were penalised: viewed as less competent, deemed 'out of control', and recommended for lower salaries.¹⁰

• The context factor: when women explained what had caused their frustration, the status penalty shrank.¹⁰

Women are trapped in a double bind: swallow your symptoms and go unsupported, or express frustration and risk being dismissed as "overly emotional."

Bringing perimenopause into the open changes how changes in demeanor are understood. It shifts the narrative from "She’s not coping" to "Her biology is navigating a profound neuroendocrine transition."

Why everyday stress feels unmanageable right now

When women ask, "Why can’t I handle things like I used to?", they assume a personal failing. In reality, the mid-life window compounds several systemic stressors:

1. Shifting brain chemistry: swings in oestrogen may affect brain chemistry linked to mood.³˒⁶

2. Fragmented sleep architecture: Night sweats and micro-arousals disrupt REM and deep restorative sleep.¹

3. Peak life load: Peak career responsibilities intersect with caring for young families and supporting ageing relatives.¹

The combination lowers your baseline resilience. Shifting your internal dialogue from "What is wrong with me?" to "What biological and environmental changes am I navigating?" is the first step toward genuine relief.

How to tell if it's perimenopause or just a busy week

Because perimenopause lacks a single universal symptom, looking for patterns across several weeks is crucial:

You don’t have to piece this puzzle together across twenty open browser tabs late at night.

👉 Take the 60-Second Perimenopause Quiz

Get an instant, structured summary of your symptoms that you can print and bring directly to your next GP appointment.

4 practical steps to reclaim your ground

1. Name the reality without self-judgement

Reframe your inner dialogue. Transitioning from "I am becoming an irritable person" to "My stress threshold has shifted due to hormonal fluctuations" replaces guilt with actionable self-awareness.

2. Track your symptoms over 4–8 weeks

Keep a simple daily log of your cycle, sleep quality, and mood dips. A tangible timeline provides your GP with clear clinical data, making diagnosis and treatment discussions significantly more effective than general impressions.¹

3. Protect your sleep architecture

Sleep disruption and mood deterioration form a vicious cycle during the menopause transition.¹ Prioritise sleep hygiene, review your evening wind-down routine, and consult a doctor if night sweats or insomnia persist.

4. Consult a menopause-informed doctor

If low mood, mood swings, or anxiety interfere with your daily life, career, or relationships, consult a doctor. Evidence-based interventions, ranging from Menopausal Hormone Therapy (MHT/HRT) to targeted non-hormonal medical and lifestyle treatments, can restore stability.¹˒²

Frequently Asked Questions 

Can perimenopause cause sudden irritability and anxiety?

Yes. Clinical guidelines from the Australasian Menopause Society recognise perimenopause as a key vulnerability period for mood disorders, heightened anxiety, sudden anger, and emotional volatility.¹

Is mood instability caused by dropping oestrogen or fluctuating oestrogen?

Research indicates that week-to-week fluctuations in estradiol levels, rather than simply a lower overall baseline, play a critical role in destabilising mood and heightening sensitivity to daily stress.³

Can perimenopause start in your 30s?

Yes. While the average age for perimenopause onset is mid-40s, changes can begin in a woman's late 30s or early 40s. A younger age does not rule out perimenopausal hormonal shifts.

Why do some women experience severe perimenopause mood swings while others don't?

Hormonal sensitivity is highly individualized. Women with a prior history of premenstrual dysphoric disorder (PMDD), postnatal depression, or major stressful life events have an increased biological sensitivity to fluctuating neurosteroids.³

Is suppressing my emotions healthy during perimenopause?

No. Psychological research confirms that habitual emotional suppression (expressive suppression) can lower overall emotional well-being, impair memory performance, and increase physiological stress responses in interpersonal relationships.⁶˒⁷˒⁸

When should I see a GP about perimenopause symptoms?

You should see a GP if mood swings, anxiety, depression, brain fog, or sleep disruption begin impacting your quality of life, work, or relationships.

References

1. Australasian Menopause Society. Perimenopause or menopausal transition. Information sheet. https://menopause.org.au/hp/information-sheets/perimenopause
2. Jean Hailes for Women's Health. Top five GP questions on menopause and mental health. https://www.jeanhailes.org.au/articles/top-five-gp-questions-on-menopause-and-mental-health/
3. Gordon JL, Peltier A, Grummisch JA, Sykes Tottenham L. Estradiol fluctuation, sensitivity to stress, and depressive symptoms in the menopause transition: a pilot study. Frontiers in Psychology. 2019;10:1319. https://doi.org/10.3389/fpsyg.2019.01319
4. Prevalence of cognitive and mood-related symptoms in a large cohort of perimenopausal and menopausal women. BJPsych Open. https://doi.org/10.1192/bjo.2024.497
5. Australian Government Department of Health, Disability and Ageing. Could this be perimenopause? Campaign resources. 2026. https://www.health.gov.au/perimenopause/resources/campaign-resources
6. Australasian Menopause Society. What is menopause? Information sheet. https://hub.menopause.org.au/Play?pId=1c445551-8053-4afd-b2a4-d40942c0d479
7. Gross JJ, John OP. Individual differences in two emotion regulation processes: implications for affect, relationships, and well-being. Journal of Personality and Social Psychology. 2003;85(2):348-362. https://doi.org/10.1037/0022-3514.85.2.348
8. Richards JM, Gross JJ. Emotion regulation and memory: the cognitive costs of keeping one's cool. Journal of Personality and Social Psychology. 2000;79(3):410-424. https://doi.org/10.1037/0022-3514.79.3.410
9. Butler EA, Egloff B, Wilhelm FH, et al. The social consequences of expressive suppression. Emotion. 2003;3(1):48-67. https://doi.org/10.1037/1528-3542.3.1.48
10. Brescoll VL, Uhlmann EL. Can an angry woman get ahead? Status conferral, gender, and expression of emotion in the workplace. Psychological Science. 2008;19(3):268-275. https://doi.org/10.1111/j.1467-9280.2008.02079.x