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Menopause makes menstrual cycles longer and less predictable, study finds

The research analysed how cycle and period length, irregular cycles and menstrual-related symptoms change with age

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Menopause can make menstrual cycles longer and less predictable, a large study by the women’s health app Flo has found.

The study, which used a dataset of 19 million women, found that from the age of 45, women experience a dramatic increase in cycle length and variability. Prior to 45, cycles progressively shorten, but as women approach menopause, their cycles become more erratic.

This phenomenon has rarely been documented, primarily due to the frequent exclusion of this age group from menstrual cycle research.

The research, according to Flo, has shown a “holistic picture” of the cycle changes that occur across the reproductive lifespan.

All women will experience menopause in their lifetime, and yet, the symptoms and cycle patterns of this life stage are often under-researched.

The study investigated cycle and period length, irregular cycles, the most frequent menstrual-related symptoms, and how all of these factors change with age. It showed:

  • The proportion of individuals with irregular cycles was highest in participants aged 51-55 (44.7 per cent), and lowest in the 36-40 age group (28.3 per cent).

  • Frequency of logging of cramps and acne was lower in older participants, while logs of headache, backache, stress and insomnia were higher.

  • The length of the menstrual cycle and menstrual cycle related symptoms show clear age associated patterns.

  • With increasing age, cycles get shorter and more variable until age 40-44. Periods are longest in women aged 18-25, with an average duration of 5.20 days. They then gradually get shorter and last, on average, only 5.06 days in women aged 41 to 45. After that, periods become longer again, but they also become much more variable in length than in any other age group, indicating transition toward menopause.

  • Irregular cycles were most common among older women with nearly half of women aged 51-55 and nearly one in three aged 46-50 reporting cycle irregularity. This is in line with expectations as cycles become less regular during perimenopause.

  • Across all ages users experienced similar common symptoms, with cramps being the most common symptom logged. Also in the top three were tender breasts and fatigue, but only up to the age of 45, when headache took the place of fatigue.

  • With age, headache, backache, stress and insomnia were logged more often, as was happy mood, which peaked at age 50. Mood swings were highest among youngest and oldest women.

Dr Lubna Pal, professor of obstetrics and gynaecology at the Yale School of Medicine, said: “The importance of this study lies in the chronicling of menstrual cycle and symptom data for a large and diverse population of women spanning in age from early adulthood into perimenopausal years.

“Findings from this epidemiological approach based on real life data allow a more comprehensive perspective on the prevalence of menstruation related phenomenon, and if and how these may vary across stages of reproductive aging.

“The wide-ranging populations’ perspectives offered in this study can help enhance population awareness of what symptoms, if being experienced by a majority, could even be construed as ‘norm’, may even help lessen the trepidations and stigma attached to aging, and can enhance preparedness of healthcare givers in their approach to enquiry, assessment and efforts at optimising care of women across the lifespan.”

Adam Cunningham, senior research scientist on Flo’s science team and lead study author, added: “It was surprising how little research there is about women’s cycles and symptoms, with most research stopping at 40 or 45 years of age.

“At Flo, we are in a prime position to help address this knowledge gap given that we have the largest dataset when it comes to women’s menstrual cycle patterns and symptoms.

“Advancing our understanding of female reproductive health is a core part of our mission and with this research we are one step closer to closing this knowledge gap.”

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Hormonal health

Women using performance-enhancing drugs face major gaps in healthcare support

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Women using PIEDs reported difficulty accessing reliable information, testing and clinical expertise, according to a qualitative study.

Researchers interviewed nine women who used performance- and image-enhancing drugs, primarily to enhance body composition, physical appearance or sporting performance.

Participants reported problems accessing comprehensive blood and hormone testing and finding clinicians familiar with health concerns linked to women’s use of these drugs.

This has been a male-dominated area of research for a long time, so there are significant gaps in understanding women’s health care needs.

The research, led by University of Queensland School of Psychology PhD candidate Hannah Schuurs, explored how the women managed their health while using PIEDs, which include substances such as steroids and peptides.

Schuurs said: “We interviewed nine women who use PIEDs about how they managed their health throughout their PIED use.

“They reported difficulty accessing reliable information and a lack of clinical expertise and formal health care support.

“The study participants were all active in self-monitoring, tracking changes in their bodies, and actively sought formal health care support.

“But they found it hard to access comprehensive blood and hormone testing, or clinicians who were familiar with the unique health concerns associated with women’s PIED use.”

The study found participants spent considerable time educating themselves about the drugs and their potential risks.

“They often found themselves educating healthcare professionals rather than receiving guidance tailored to their circumstances.

Schuurs said: “The participants had spent considerable time educating themselves about PIEDs and their risks and found they were often educating their health care providers, rather than receiving guidance tailored to their circumstances.”

“Structural and systemic barriers shifted a disproportionate level of responsibility for harm reduction and care coordination onto the women themselves.”

Participants were also aware of sex-specific risks, including hormonal disruption and virilisation. Virilisation is when masculine physical traits develop due to high levels of androgens.

However, the women did not necessarily expect healthcare professionals to have all the answers.

Schuurs said: “Participants were often understanding of gaps in clinical knowledge, provided they were met with openness and a willingness to work collaboratively.

“They emphasised that respectful, nonjudgmental health care relationships were just as important as technical expertise.”

The findings also challenged stereotypes that people using PIEDs are uneducated or indifferent to their health.

Participants reported actively managing their health while navigating stigma, uncertainty and gaps in healthcare.

Schuurs said: “The participants actively managed their health and navigated stigma, uncertainty and gaps within health care.”

“We need health care responses that are collaborative rather than judgmental, as those narratives can oversimplify people’s experiences and make it harder for them to seek support.”

She said the research showed PIED use could form part of wider goals relating to health, wellbeing, performance and self-management.

Schuurs said: “Better understanding women’s experiences is critical if we want health care systems to respond effectively and ensure women can access the support they need.”

“There is a real opportunity to improve education, clinical guidance and support for health care professionals in this space that values and draws from the lived experience of women themselves.”

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Mental health

Endometriosis linked to higher use of mental health meds, study finds

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Women later diagnosed with endometriosis used more antidepressant and anxiety medication than other women, with the pattern emerging years before diagnosis, recent study found.

The difference was evident up to 10 years before diagnosis and continued for a decade afterwards, according to a large Danish registry-based study involving 136,842 women.

Women with the condition also had substantially more contact with psychiatric hospital departments than those without it.

Researchers at Aarhus University found that women with endometriosis redeemed 29 per cent more prescriptions for antidepressants and 16 per cent more for anxiety medication in the years before diagnosis.

After diagnosis, the differences rose to 40 per cent for antidepressants and 46 per cent for anxiety medication.

Marie Josiasen, PhD student at the department of public health and one of the researchers behind the study, said: “What surprised us was how clear and persistent the pattern was, and that the difference did not diminish over time.

“On the contrary.

“Women with endometriosis consistently redeemed more prescriptions for antidepressant medication than women without the disease throughout the entire period, from ten years before to ten years after diagnosis.”

The study does not provide an answer as to what causes the mental strain.

Josiasen said prolonged pain, uncertainty about the cause of symptoms and fertility problems could be among the factors contributing to psychological strain.

She said: “It’s possible that prolonged pain, uncertainty about the cause of the symptoms, and frustration over not being able to live the life one wants may be among the reasons. For some women, fertility problems can also be a major psychological burden.”

Researchers also found that the gap compared with women without endometriosis did not narrow after diagnosis. Instead, it became more pronounced in the years that followed.

Josiasen said: “A diagnosis can be a relief, but it also involves coming to terms with having a chronic illness.”

The study does not indicate whether diagnosing endometriosis earlier could reduce psychological strain.

As part of her PhD project, Josiasen will investigate the role hormonal contraception may play in the mental health of women with endometriosis.

She said: “We can see that many receive medication and are in contact with psychiatric services. But we still lack an understanding of what actually helps these women.

“That’s what I want to help find out.”

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Hormonal health

Calla Lily joins US$50m antibiotics programme

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Calla Lily Clinical Care has joined a US$50m antibiotics programme to assess vaginal delivery of UTI treatments through its Callavid platform.

The women’s health medical technology company will evaluate whether antibiotics can be delivered directly through the vaginal wall to treat urinary tract infections (UTIs).

The project will use Callavid, the company’s intravaginal drug delivery platform, aiming to deliver treatment to the site of infection while limiting systemic exposure.

Calla Lily has been selected for Wellcome Leap’s Focused Antibiotics programme, which is exploring ways to reformulate existing antibiotics so they reach infections while sparing the gut microbiome without loss of efficacy.

Dr Serena de Gelidi, Principal Investigator and R&D Manager, Calla Lily Clinical Care

The programme is backed by US$50m and aims to investigate technologies that could reduce the unintended effects of antibiotic treatment.

UTIs are among the most common bacterial infections in women. According to the source material, women are prescribed almost 40 per cent more antibiotics than men between the ages of 16 and 54.

Calla Lily will assess whether Callavid can deliver antibiotics through the vaginal wall while bypassing gastrointestinal transit and first-pass metabolism.

The company expects the approach could keep systemic exposure below 5 per cent.

There is currently no first-line UTI antibiotic available in a mass-manufactured vaginal formulation, according to Calla Lily.

The company said a successful project could contribute to the wider programme’s goal of reducing antibiotic-driven resistant infections by up to 40 per cent a year.

Callavid has a patented, leak-free, tampon-like design intended to deliver medicines and hormones through the vagina.

The platform is already being assessed in the NIHR-funded FREEDOM trial, which is studying vaginal progesterone delivery using Callavid.

That study began in April 2026 and is examining safety, user acceptability and drug absorption. According to the company, it has passed its safety stopping rule and 90 per cent of patients have completed their first round of dosing.

Dr Lara Zibners, co-founder and chair of Calla Lily Clinical Care, said: “Women are disproportionately impacted by urinary tract infections, yet the consequences of that repeated systemic exposure have been largely overlooked. Organisations such as Wellcome Leap play a vital role in tackling major healthcare challenges through bold innovation. We are honoured to be part of the Focused Antibiotics programme and to explore the potential of Callavid in a foundational antibiotic application, demonstrating how women’s health innovations can deliver benefits far beyond fertility and reproductive care.

Thang Vo-Ta, co-founder and chief executive of Calla Lily Clinical Care, said: “Being selected by Wellcome Leap, one of the world’s most ambitious health innovation funders, is a significant validation of what we are building at Calla Lily Clinical Care. Our ambition has always been for Callavid to become the defining platform for intravaginal drug delivery across a wide range of indications. The Focused Antibiotics programme gives us the ideal partner to pursue one of the most consequential of those indications: treating the world’s most common bacterial infection in women while helping to address a global resistance crisis that, left unchecked, could claim eight million lives annually by 2050. This marks a pivotal moment in demonstrating that when you solve for women, you solve for everyone.”

The project will be led by Dr Serena de Gelidi, principal investigator and R&D manager at Calla Lily Clinical Care.

She will be supported by Professor Andrew Lewis, principal scientist at the company and an international authority on drug-eluting systems, with 58 patents and more than 260 peer-reviewed publications.

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