You’re celebrating the fact that, at long last, your menstrual cycle has become more regular. No more surprise arrivals mid-holiday! No more begging for tampons before PE! But just as you think your womb has settled down, another problem arises: your flow starts to get heavier. 

Sadly, it’s not just a phase: your period really may get heavier as you age.

“For some women, periods do get heavier as they age, and initially this is influenced by whether they are ovulating each month,” says Dr Penelope Law, gynaecologist from menstrual brand Luna Daily. She explains that our first few periods tend to be lighter because our first few periods are anovulatory – meaning the womb lining is shed but no egg has been released. 

After a few years, our hormones tend to have settled, and in our 20s, we should have an understanding of what a normal flow is like to us. “It’s hard to say what’s normal because cycles are variable depending on the individual, but many might expect their normal to be bleeding for five to seven days, requiring three or four tampons or pads a day and not needing to take time off work due to severe pain,” says Dr Law.

However, some people notice that their periods change again around the age of 30, says Dr Helen O’Neill, founder of at-home hormone testing brand Hertility. 

“A change in your period at this time could be linked to underlying reproductive health conditions such as fibroids, endometriosis or PCOS,” she says.

According to the NHS, fibroids are non-cancerous growths that develop in or around the womb and affect approximately one in three women. They are mostly diagnosed in women aged between 30 and 50, with one of the most common symptoms being heavy periods. They tend to disappear without treatment, but if you’re suffering from symptoms, make sure you talk to your GP.

The biggest changes in our flow happen around perimenopause.  

“Perimenopause, the transition phase before menopause, is when some people report having heavier periods,” explains Dr O’Neill. “As you approach menopause, the drop in the important hormone oestrogen can cause changes such as the shortening or lengthening of the time between periods or a change in the amount of flow.”

Research in 2010 concluded that “there was a strong trend toward an increase in menstrual blood loss with advancing reproductive age”. Researchers found that women who were in the late menopausal stage transition experienced excessive menstrual bleeding (greater than 200ml of blood loss during their period – the ​​average menstrual blood loss is around 33.8ml in people aged 25, which increases to an average of 62.4ml by the age of 50.

Other events that happen over our reproductive years can change our flow too. “Sometimes people notice a change in their flow after switching their method of contraception, such as just starting or coming off the pill or having recently had an IUD fitted,” explains Dr O’Neill. This can go both ways – making periods heavier or lighter, so it’s important you find contraception that works for you.

And pregnancy has an effect on our bleeds too – and not just the nine months we go without them. “Periods are influenced by the cyclical combination of oestrogen and progesterone. Pregnancy gives this cyclical pattern a rest, and women who have heavy periods due to endometriosis often find that their periods are better for a while after having a baby,” explains Dr Law. However, the NHS reports that the first few bleeds after pregnancy for healthy women may be heavier, but eventually return to their old flow.

“It’s also normal to have minor changes in your periods from cycle to cycle because they are very easily influenced by things like stress, diet, lifestyle, illness and travel to name a few.

“However, if you notice your cycles have suddenly changed in flow or regularity it could be linked to an underlying reproductive health condition such as polycystic ovary syndrome (PCOS) or premature ovarian insufficiency (POI), so it’s best to check in with a doctor,” says Dr O’Neill. 

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