Perimenopause guides

Clear, sourced answers to the questions women actually search — each one starts with the short answer. Zero panic, zero hype.

• Perimenopause age: when it starts, and how long it lasts

  Perimenopause usually starts in your mid-40s, but it can begin as early as your mid-30s or as late as your mid-50s. It lasts about four years on average and can run to eight or more. It ends at menopause — twelve months in a row without a period — which most commonly happens between 45 and 55.

• Irregular periods in perimenopause: what’s normal, and what isn’t

  Irregular periods are often the first sign of perimenopause. Early on, cycles usually vary by seven days or more from month to month; later, you may go 60 days or more between periods. Flow can get heavier or lighter. Get checked if bleeding gets much heavier, happens between periods or after sex, or returns after twelve months without a period.

• Perimenopause vs menopause: what’s actually different

  Perimenopause is the transition leading up to menopause, when hormones fluctuate and periods become irregular; it usually starts in your mid-40s and lasts about four years on average. Menopause is a single point in time: twelve consecutive months without a period. After that, you're postmenopausal. Most symptoms people call “menopause” begin in perimenopause.

• Perimenopause fatigue: why you’re this tired, and what actually helps

  Perimenopause fatigue usually comes from several things stacking up: broken sleep from night sweats and early waking, heavier periods that can lower iron, mood changes, and gradual muscle loss. Start with sleep — a fixed wake time, caffeine before 11 a.m. — and ask your clinician to check iron, thyroid and B12, because those overlap and are easy to test.

• Perimenopause weight gain: a kinder, more accurate story

  In perimenopause, the bigger change is often body composition rather than the number on the scale. In the long-running SWAN study, about two years before the final period the rate of fat gain doubled and lean muscle began to decline, with fat shifting toward the middle. Protein, strength training and better sleep are the most useful responses.

• Perimenopause heart palpitations: what they are, and when to worry

  Heart palpitations are common in perimenopause — a 2022 review found up to 42% of perimenopausal women report them — and they're linked with hot flashes, poor sleep and lower physical activity. The NHS advises seeing a GP about palpitations. Get emergency help if they come with chest pain, fainting or severe breathlessness.

• Perimenopause brain fog: real, common, and usually temporary

  Perimenopause brain fog is real: the large SWAN study found a temporary dip in processing speed and verbal memory during perimenopause that resolved after menopause. Broken sleep, anxiety and low mood make it worse. Externalising your to-do list, protecting focus time and fixing sleep help most. Sudden or worsening confusion should always be checked.

• Signs perimenopause is ending — and how you’ll actually know

  The clearest sign perimenopause is ending is longer gaps between periods — going 60 days or more without one marks the late transition. Hot flashes often peak around this stage. There's no way to know which period will be your last; menopause is confirmed only after twelve consecutive months without a period.

• Perimenopause rage: when irritability arrives faster than the thought behind it

  Perimenopause rage is intense irritability or anger linked to the hormonal transition, amplified by broken sleep and stress. Women with a history of hormone-related mood changes — like PMDD or postnatal depression — may be more affected. Tracking mood against your cycle, protecting sleep and getting support all help. Persistent low mood deserves a doctor's appointment.

• Why you wake up at 3am in perimenopause

  The early-hours wake-up is one of the most common perimenopause symptoms. What causes it, what tends to help, and when to see a clinician.