Somewhere in your early-to-mid 40s, sometimes earlier – your body begins a transition that nobody prepared you for. Your periods might still be regular. You might feel perfectly fine some days. But on others, you can't find the word you're looking for mid-sentence, you wake at 3am with your heart pounding, or you feel a wave of anxiety that doesn't correspond to anything actually happening in your life.
This is perimenopause. And for most women, it starts years; sometimes a decade – before their last period.
What perimenopause actually is
Perimenopause is the transitional phase leading up to menopause (the point at which you've had no period for 12 consecutive months). During this phase, your ovaries gradually produce less oestrogen and progesterone. But this isn't a smooth, linear decline; it's erratic. Hormone levels fluctuate unpredictably, which is exactly why the symptoms can feel so inconsistent and confusing.
The average age of menopause in Singapore is around 49 - 51. That means perimenopause – which can last between 4 and 12 years – can begin in your late 30s or early 40s. Many women don't connect what they're experiencing to hormones at all.
The symptoms most doctors don't mention
Hot flashes and night sweats are the ones everyone knows. But they're far from the only – or even the most common – experience for women in Singapore, where many women report fewer vasomotor symptoms than their Western counterparts, but more cognitive and mood-related changes.
Here's what perimenopause can actually look like:
Brain fog and cognitive changes
Forgetting words mid-sentence. Walking into a room and not knowing why. Reading the same paragraph three times without it landing. This is one of the most distressing perimenopause symptoms precisely because it feels so unlike ordinary forgetfulness and because it can feel frightening. Oestrogen plays a significant role in brain function, and its decline affects memory, focus, and processing speed.
Sleep disruption
Waking between 2am and 4am, often with no obvious cause, is extremely common in perimenopause. Progesterone has a calming, sleep-supporting effect – as it drops, sleep architecture changes. Many women find they can fall asleep fine but can't stay asleep. This compounds everything else, because chronic sleep disruption worsens mood, cognitive function, and physical resilience.
Anxiety and mood changes
Anxiety that feels different from anything you've experienced before; more physical, more free-floating, harder to talk yourself out of. Irritability that comes fast and feels disproportionate. Low mood, sometimes with a sense of flatness or numbness. These are hormonal, not psychological failings. Oestrogen has a significant influence on serotonin and GABA – the brain's key mood-regulating chemicals.
Heart palpitations
A racing or fluttering heart, often in the evening or at night, alarms many women into thinking something is wrong with their heart. In most cases (and after ruling out cardiac causes with your doctor), palpitations in perimenopause are driven by oestrogen fluctuation affecting the autonomic nervous system. They're uncomfortable, but usually not dangerous.
Changes to your period
Periods may become irregular – closer together, further apart, heavier, lighter, or all of the above at different times. Very heavy periods are common in early perimenopause, when oestrogen is still relatively high but progesterone has begun to decline. This imbalance can cause the uterine lining to build up more than usual.
Joint pain and muscle aches
Oestrogen has anti-inflammatory properties. As levels decline, joint pain – particularly in the hips, knees, and hands – can increase. This is often dismissed or attributed to 'getting older', when in fact it's hormonal.
Changes to libido and vaginal health
Reduced libido is extremely common and is driven by both declining oestrogen and testosterone. Vaginal dryness, which can make sex uncomfortable or even painful, begins earlier than most women expect – often years before menopause. This is also one of the most treatable symptoms, with topical oestrogen highly effective and safe.
Weight changes and body composition shifts
Many women notice weight accumulating around the abdomen even without dietary changes. This is driven by declining oestrogen, which changes where the body stores fat, combined with a natural age-related decline in muscle mass. The shift is hormonal, not simply a failure of willpower.
Why Singapore women often go undiagnosed
Perimenopause is systematically under-recognised – and Singapore women face some specific barriers: GP consultations are short. Symptoms are dismissed or misattributed – anxiety gets treated as anxiety, joint pain gets attributed to age. Many women don't know perimenopause can start this early. And there is still cultural silence around menopause in Singapore.
What to do if you think you're in perimenopause
Track your symptoms. Keep a simple daily log of what you're experiencing – mood, sleep, cycle changes, cognitive symptoms, physical symptoms. A pattern over a few months is far more useful to a doctor than a vague sense that things have changed.
Ask specifically. When you see a doctor, be direct: "I think I may be in perimenopause. Can we discuss my hormone levels and what options I have?"
Seek out a menopause-trained doctor. Not all GPs have deep training in perimenopause management. Gynaecologists who specialise in hormonal health will give you a more complete conversation.
Understand your options. Hormone replacement therapy (HRT) is the most effective treatment for most perimenopause symptoms and, for healthy women under 60 without specific contraindications, the current evidence strongly supports its safety.
Address the lifestyle factors you can control. Strength training, prioritising sleep, limiting alcohol, and managing stress all have meaningful effects.
You're not imagining it
If you've been feeling like something is off and you can't explain it – if you've been told your results are normal, or that it's just stress, or that it's just getting older – consider whether perimenopause might be the thread connecting everything.
It often is. And knowing that changes everything.