Your hormones, from first period to last

From the first surprise of puberty to the quiet shift of menopause, your hormones write a story across your whole life. Here is that story, told gently, so the next time your body does something unexpected you can meet it with curiosity.

⏱️ 8-minute read · Words by Chiara Ugozzoli · Updated June 2026

You know the feeling. One week you feel bright, capable, ready for anything. The next, you feel tearful over a song in a shop, your jeans feel tighter, and you wonder where your energy went. For a long time many of us were taught to shrug this off, to push through, to keep it private. The truth is gentler and far more interesting: a steady tide of hormones is moving through you, and once you understand its rhythm, your body starts to make a lot more sense. This is your friendly tour, decade by decade.

TLDR: Your reproductive hormones, mainly oestrogen and progesterone, rise and fall in a monthly cycle from your first period through to menopause. Knowing the broad pattern helps you read your own signals, ask sharper questions, and feel more at home in your body across every decade.

What actually happens during your monthly cycle?

Think of your menstrual cycle as a quiet, looping conversation between your brain and your ovaries. For most women a full loop takes around 28 days, although the NHS confirms that anything from 21 to 35 days counts as a regular cycle. Your number is yours, and it can shift a little month to month, which is completely usual.

The cycle begins on the first day of your period. Here, oestrogen and progesterone sit low, the womb lining sheds, and you bleed. According to the NHS, a period usually lasts about 5 days, with the heaviest flow in the first 2 days, and most women lose roughly 1 to 5 tablespoons of blood across the whole period. As the bleed ends, oestrogen climbs. This is often the bright, energetic stretch, when skin looks clearer and mood lifts.

Around the middle of the cycle, ovulation arrives: an egg is released. Oestrogen peaks, then progesterone takes the lead to prepare the womb for a possible pregnancy. In the days before your next period, both hormones drop again. That drop is the trigger for the familiar premenstrual shifts: bloating, tender breasts, mood swings and irritability. The NHS lists these among the typical signs of PMS, or premenstrual syndrome, which usually ease once bleeding starts. When you can map your week onto this loop, the emotional weather makes far more sense.

Picture this. It is day 22, your sofa feels like the only safe place in the world, and a kettle advert makes you well up. This is your hormones dipping ahead of your period, right on schedule. Naming it as a phase, with a clear beginning and end, can turn a baffling evening into something you simply ride out.

Why does it all begin with your first period?

The whole cycle switches on during puberty. The NHS notes that periods usually begin around age 12, with some girls starting earlier and others later, and most settling into a regular rhythm by 16 to 18. That first period, called the menarche, marks the moment your ovaries begin their long, rhythmic release of oestrogen. It is a genuine milestone, even when it arrives quietly on an ordinary Tuesday.

Oestrogen does far more than manage periods. It is one of your body’s great multitaskers. As the NHS explains in its menopause guidance, oestrogen helps keep bones strong, supports mood and memory, looks after the heart and arteries, and keeps tissues that need moisture comfortable. So when oestrogen rises and falls, you may feel the ripple in your sleep, your skin, your concentration and your confidence. That web of effects explains why hormones feel like they touch everything, because in a real sense they do.

What changes as you move through your thirties and forties?

Through much of adult life, the cycle hums along in the background. Many women find their patterns shift after pregnancy, while breastfeeding, or when starting or stopping hormonal contraception, and all of that falls within the wide range of normal. The headline point is reassuring: a cycle that varies a little, month to month, is usually just a cycle being a cycle.

Then, often in your forties, a new chapter opens quietly. The amount of oestrogen your ovaries make begins to decline, and you enter perimenopause: the years of symptoms that arrive while you are still having periods. One of the first clues, the NHS says, is a change to your periods themselves. They may come closer together or further apart, and the bleeding may get heavier or lighter. Sleep can fray, mood can swing, and hot flushes may begin to visit.

This stage can stretch across several years, and that length surprises a lot of women. Knowing it is coming, and that it is a normal passage of life, gives you something solid to stand on. You can prepare for it the way you would prepare for any big season: with information, support, and a little self-compassion banked in advance.

And what about menopause itself?

Menopause has a precise meaning: it is the point when you have gone 12 months free of any period. Everything after that is called postmenopause. The NHS reports that menopause usually happens between the ages of 45 and 55, and that the average age in the UK is 51.

Because oestrogen settles at a lower level, the body adjusts, and symptoms can show up in many forms. The NHS describes a broad list: hot flushes and night sweats, sleep problems, mood changes, brain fog, weight gain that often settles around the middle, vaginal dryness, joint aches, and more. It also notes that symptoms usually last around 7 to 9 years, sometimes longer, and that they can change shape over time, with one symptom easing as another appears. Treatments and support exist, so this is very much a chapter you can actively shape and move through with help.

There is an equality point worth holding too. The NHS highlights that ethnic background can influence symptoms; for example, women from a Black ethnic background are more likely to experience hot flushes that are severe and last longer. Your experience is shaped by who you are, which is one more reason to seek care that listens to you specifically and takes your story seriously.

Try this tonight: Start a simple cycle diary. On your phone or in a notebook, jot the date of bleeding, your energy out of ten, your sleep, and your mood. Keep it for three months. Patterns you have lived with for years will start to appear on the page, and that little record becomes pure gold in any conversation with your GP.

How can you work with your hormones, moving with the tide?

Start with kindness toward the dips. When you can see that low mood or low energy often clusters in the days before your period, you can plan softer commitments for that window and save the bold plans for your brighter, higher-oestrogen days. Working with your own tide feels much better than fighting it, and it tends to make you more productive overall, since you spend your best energy where it lands.

Steady habits help your whole system stay resilient: regular movement, meals that keep your energy even, and protected sleep all support how you feel through every phase. During perimenopause and beyond, looking after your bones and heart becomes especially worthwhile, since oestrogen had been quietly helping with both. Weight-bearing exercise, plenty of calcium-rich foods, and time outdoors for vitamin D all give your future self a real gift.

And keep talking. For decades, women carried this knowledge in whispers. Sharing it openly, with friends, with daughters, with a trusted clinician, turns a confusing solo experience into something shared and far lighter to hold. Every honest conversation chips away at the old hush, and the next generation inherits a little more clarity than we did.

The gentle takeaway

Your hormones are with you for the long haul, from that first surprising period to the quiet steadiness of postmenopause. They lift you, dip you, and shape your days in ways that once felt mysterious. Read your own rhythm, keep a light record, lean on the people and professionals who listen, and treat yourself with the patience you would offer a good friend. Your body has been speaking to you all along. The lovely part is learning, at last, to understand its language and to answer it with care.

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References

1. NHS. Periods (overview). https://www.nhs.uk/conditions/periods/
2. NHS. Menopause and perimenopause. https://www.nhs.uk/conditions/menopause-and-perimenopause/
3. NHS. Symptoms of menopause and perimenopause. https://www.nhs.uk/conditions/menopause-and-perimenopause/symptoms/

PrettyWell is a women’s lifestyle and wellbeing magazine. This article shares general information and wellbeing perspectives to help you ask better questions and feel more in charge; for anything about your own health, please speak with a qualified healthcare professional.