Menopause and Perimenopause: Symptoms, Timeline and When to Test

Cycles that arrive early, then late, then not at all. Waking at three in the morning for no reason. A short fuse that does not feel like you. Menopause rarely announces itself cleanly — it arrives as a scatter of symptoms that are easy to attribute to stress, work or age. This guide sets out the timeline, what is worth testing, and — just as importantly — what usually is not.

Perimenopause, menopause, postmenopause

The three terms get used interchangeably, but they describe different stages.

Most of what people call "menopause symptoms" actually belong to perimenopause — the years of fluctuation before periods stop for good. It is the hormonal instability, not the low level itself, that drives the worst of it.

Symptoms worth recognising

Hot flushes are the best-known sign, but they are far from universal and often not the most disruptive:

• Cycle changes — usually the earliest signal. Cycles become shorter, then longer, then skip.
• Hot flushes and night sweats — affecting around three in four women, though severity varies enormously.
• Sleep disruption — frequently waking in the early hours, with or without sweats.
• Mood and irritability — low mood, anxiety, or a shorter fuse that feels out of character.
• Brain fog — word-finding difficulty and poorer concentration. Genuinely common, and usually temporary.
• Vaginal dryness and discomfort — unlike most symptoms, this tends to persist and worsen without treatment.
• Joint aches and palpitations — often overlooked as menopausal, and frequently investigated for other causes first.

When a hormone test actually helps

This is where a lot of unnecessary testing happens, so it is worth being direct about it.

If you are over 45 and having typical symptoms with changing periods, international guidance is that a hormone blood test is not needed. FSH and oestradiol swing so widely during perimenopause that a single sample can read entirely normal in a woman who is clearly transitioning, and vice versa a fortnight later. The diagnosis is made from your symptoms and cycle pattern, not from a number.

Testing does earn its place in specific situations:

• Under 40 with absent or irregular periods — premature ovarian insufficiency needs actively excluding, and it changes management substantially.
• Aged 40 to 45 with menopausal symptoms — FSH can support the picture where early menopause is suspected.
• After a hysterectomy without oophorectomy — with no cycle to track, symptoms and FSH carry more weight.
• On hormonal contraception — which masks the cycle and makes the clinical picture unreliable.

The tests that are more useful at this stage

While hormone levels are often unhelpful, this is an excellent moment to look at the things that genuinely change with menopause — and at the conditions that imitate it.

Ruling out the mimics

• Thyroid function (TSH) — an underactive thyroid produces fatigue, weight gain, low mood and irregular periods. It is the single most common condition mistaken for perimenopause.
• Full blood count — heavy or prolonged perimenopausal bleeding is a frequent cause of iron-deficiency anaemia, which drives its own fatigue and brain fog.
• Vitamin D and B12 — both common deficiencies in Malaysia, and both produce fatigue and low mood.

Tracking what genuinely shifts

Falling oestrogen changes cardiovascular and bone risk in ways that are measurable, and worth a baseline:

• Lipid profile — LDL cholesterol typically rises after menopause, and cardiovascular risk climbs to meet that of men.
• HbA1c and fasting glucose — insulin sensitivity tends to fall, and body fat redistributes toward the abdomen.
• Blood pressure — which commonly drifts upward across this decade.

That metabolic shift is the part most often missed. Women frequently describe eating and exercising exactly as before while weight settles around the middle for the first time. That is a real physiological change, not a failure of discipline — and it responds far better to a targeted plan than to simply eating less.

We look at this in more detail in our guide to hormone imbalance in women over 40 .

When to see someone

• Periods have stopped before the age of 45, or become irregular before 40.
• Bleeding is unusually heavy, prolonged, or occurs between periods.
• Any bleeding at all after twelve months without a period — this always needs assessment.
• Symptoms are affecting your work, relationships or sleep.
• You want a baseline of your metabolic and bone health as you enter this stage.

That third point deserves emphasis. Postmenopausal bleeding is never something to monitor at home — it warrants prompt assessment, even when the likeliest explanation turns out to be benign.

At HDC Medical, screening is dietitian-led, which suits this stage particularly well: the changes that matter most through menopause are metabolic and nutritional, and they respond to structured, practical dietary work. A hormone test is available where it is genuinely indicated — and we will tell you plainly when it is not.

This article is for general education and does not replace personalised medical advice. Reference ranges vary between laboratories — always interpret your results with a qualified professional. Blood screening is a monitoring and early-flag tool, not a diagnosis. HDC Medical is a dietitian-led health screening centre in Oval Damansara, Kuala Lumpur.