Perimenopause vs menopause, what is the difference?

Perimenopause is the stretch of time when the ovaries begin to wind down unevenly. Hormones fluctuate rather than simply fall, periods become irregular in timing and heaviness, and symptoms like hot flushes, broken sleep, and shifting mood tend to appear. For many women it begins in the mid-forties and lasts around four years, though it can be much shorter or considerably longer (Journal of Clinical Endocrinology & Metabolism, 2021). This is the stage when most of what people call menopausal symptoms are actually happening.

Menopause itself is not a phase, it is a point. Specifically, it is the day of your final menstrual period, and it can only be confirmed twelve months later, once you have gone a full year with no periods at all. There is no test that announces it in the moment. You reach it in retrospect.

Once you have passed that twelve month mark, you are postmenopausal, and you remain so for the rest of your life. Some symptoms ease in this stage, while others, particularly vaginal and urinary changes, can persist or even progress. The lower oestrogen of postmenopause also brings longer-term considerations for bone and heart health.

Knowing which stage you are in changes what is normal and what is worth acting on. Irregular periods are expected in perimenopause but need checking after menopause. Recognising that the symptomatic years are the transition, not menopause itself, also helps make sense of why things feel so changeable, the hallmark of perimenopause is that hormones are swinging, not that they have simply switched off.

See your GP if periods become very heavy or close together, if bleeding returns after a year with no periods, or if symptoms begin before 45, which warrants a different assessment. anna does not diagnose, and this article is not medical advice.