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PCOS to PMOS: What the New Name Means for People with Hypermobility

A hear with ovaries and scrabble tiles underneath reading PCOS
Adam Foster
Latest posts by Adam Foster (see all)

Prague, 12 May 2026. One of the most common hormonal conditions affecting women got a new name, and not through a quick committee vote or a marketing refresh, but through a 14-year international consensus process involving 56 organisations and around 14,360 survey respondents [1]. PCOS, the label that has followed women around for decades, is now PMOS: Polyendocrine Metabolic Ovarian Syndrome. Diagnostic criteria haven’t changed, and treatment recommendations haven’t changed [1], [2], but the framing has, and for the hypermobile community framing matters more than it probably should, because framing shapes what gets screened for, what gets taken seriously, and whose symptoms get joined up into something coherent.

PMOS overlaps with a symptom set we already see regularly in our studios: pain that moves around, fatigue that doesn’t shift with rest, sleep that breaks for multiple reasons, and joints that complain disproportionately to the load. So this piece walks through what’s actually changed, what the science says about the shared biology, and where the research is still genuinely missing.

What’s actually changed on 12 May 2026

The noise around this rename has been loud, and the substance in most coverage has been thin.

The announcement came at the European Congress of Endocrinology in Prague on 12 May 2026 [1]. The accompanying paper in The Lancet that same day formalised a name change that has been quietly building for years, giving the condition a label that actually reflects what it is [1]. Polyendocrine Metabolic Ovarian Syndrome. “Polyendocrine” because more than one hormone axis is involved. “Metabolic” because insulin and glucose handling are central to what’s going on. “Ovarian” because the location still matters, even if it isn’t the whole story. “Syndrome” because, well, that part stays [1], [3]. If you’re new here, our primer on [what hypermobility actually is](https://www.thefibroguy.com/hypermobility/) is a sensible starting point before going further.

Why the change? Because the word “cystic” has been misleading clinicians, women, and policymakers for years [1]. The “cysts” the old name described aren’t cysts in the way most people imagine, they’re small follicles visible on imaging, and they’re not even necessary for diagnosis [2], [1]. A 2026 commentary in Metabolism Open puts it plainly: the rename reflects the metabolic and multi-endocrine reality of the condition rather than the ovarian morphology that gave it its old name [3]. A 2025 commentary in Endocrinology and Metabolism, looking at the shift from 2018 to 2023 guideline updates, had already been moving the diagnostic emphasis in the same direction. AMH allowed as an alternative to ultrasound in adults, simpler algorithms, explicit recognition of weight stigma, and elevated mental health screening at diagnosis all featured [4].

A 2025 longitudinal international online survey in eClinicalMedicine asked women living with the diagnosis and the clinicians treating them whether the name needed to change [5]. Strong support came back from both sides, and the “cystic” bit, in particular, came in for stick [5]. If you want a sense of [who we are](https://www.thefibroguy.com/about/) and why we write these pieces from a rehab angle rather than a clinical one, that’s worth a minute.

On the actual diagnostic criteria, nothing has been ripped up. The Rotterdam approach still stands: two of three out of hyperandrogenism, ovulatory dysfunction, and polycystic ovarian morphology, with AMH allowed instead of ultrasound in adults [2]. The 2018 international guideline that established Rotterdam as the global diagnostic standard hasn’t been thrown out, it’s been built on [6]. Treatment principles also haven’t moved, with lifestyle interventions remaining first line, letrozole staying first line for ovulation induction, and psychological screening at diagnosis still mandated [2].

What’s different is the three year transition timeline, tied to the 2028 International Guideline update and the ICD-11 alignment that follows [1]. If you’re sitting in front of a GP who still says PCOS for the next while, that’s expected. Adoption is gradual, and it always is with something this embedded in clinical practice.

Some wider context here. PMOS is one of the most common endocrine conditions affecting women, with around 1 in 8 women globally meeting diagnostic criteria [1]. That’s a lot of women carrying a diagnosis whose name was misleading them, their doctors, and the policymakers writing screening protocols. The clinical community has been edging toward this rename for years, and the 2026 rename is the next logical step after the 2018 and 2023 guideline updates [2], [4], [6].

The bit worth sitting with is the reframing itself. “Metabolic” pulls the conversation toward insulin resistance, androgen excess, and chronic low grade inflammation [3], [7], [8], and “polyendocrine” forces clinicians to stop thinking ovary first and start thinking hormones across systems [3]. The moment we start thinking hormones across systems, the people in our studios with hypermobility, EDS, hEDS, and the whole HSD spread start to look very relevant.

Why this matters specifically if you’re hypermobile

Hormones and connective tissue aren’t separate systems, and they share receptors, inflammatory pathways, and insulin and androgen signalling, so a condition framed as hormonal and metabolic, sitting alongside a condition framed as connective tissue based, almost certainly overlaps at the biological level before we even get to symptom overlap.

Hypermobility doesn’t exist in isolation, it clusters. A 2024 review pulled together data showing hypermobility detected in 30 to 57% of people with ME/CFS, fibromyalgia, POTS, and Long COVID [9]. The proposed shared pathophysiology of connective tissue fragility, mast cell activation, dysautonomia, and systemic inflammation is the same biological neighbourhood PMOS science is now heading into [9].

We’ve got plenty of evidence the hypermobile population carries elevated multisystem disease burden. A US claims database of nearly 20,000 young people with hEDS, matched against a control pool of nearly 5 million, found digestive, cardiovascular, and anxiety diagnoses substantially more common in the hypermobile group [10]. Gut problems were roughly twice as common, cardiovascular issues over four times as common, and anxiety noticeably elevated against controls [10]. The paper itself doesn’t headline endocrine categories, so we can’t pull a clean PMOS-relevant rate out of it, but the multisystem picture is consistent with what we see in clinic [10].

Then there’s the gynaecological picture specifically, and it’s a telling one. A 2016 French cohort study from Paris followed 386 women with joint hypermobility syndrome and hypermobile EDS [11]. Single arm, no control group, but the frequencies within the cohort were striking: most reported heavy bleeding, most reported painful periods, and just under half of the sexually active women reported painful intercourse [11]. A 2019 scoping review of pelvic and urogenital complications in EDS reported pelvic organ prolapse and urinary incontinence as common findings, alongside painful intercourse and painful periods turning up in a sizeable number of studies [12]. A 2023 narrative review of female reproductive health across Long COVID and associated illnesses, including ME/CFS, POTS, and EDS, reported painful periods in around seven in ten women with EDS, and painful intercourse in roughly half [13]. Elevated rates of ovarian cysts, pelvic congestion, uterine fibroids, and endometriosis also showed up in the wider ME/CFS and POTS cohorts overlapping with EDS [13]. A 2024 cluster analysis of a hEDS registry identified phenotypic clusters that included endocrine and reproductive comorbidities [14], and a large online survey of women with EDS and HSD reported probable vulvodynia, that’s chronic vulval pain, at around six times the general population rate [15].

That’s a lot of signal. The catch is that none of it adds up to a published prevalence rate of PMOS inside a hypermobile cohort, because nobody’s done the dual diagnosis prevalence study. We can’t tell you that X% of women with hEDS have PMOS. What we can tell you, honestly, is that the symptom overlap is meaningful, the mechanisms are plausible, the clinical observation is consistent, and the formal prevalence work hasn’t been done yet. The clustering picture is well documented elsewhere, including in our overview of [the POTS, EDS, and MCAS trifecta](https://www.thefibroguy.com/blog/pots-eds-and-mcas-understanding-the-trifecta/).

I had a client not long ago, a runner in her early thirties, diagnosed with hEDS, who had been told for two years that her cycle related joint flares were “just hormonal”, and separately told her acne, irregular periods, and fatigue were “probably PCOS, mild”. Two different doctors, two different files, no joined up picture. She’s not unusual. The women walking in with the hypermobility label are also, frequently, the women walking in with a PCOS or now PMOS file open in another corner of their record, and nobody’s holding the two together.

That’s the gap this piece is trying to nudge, not by claiming we know more than the literature does, but by pointing out that two stories the medical system tells in separate offices are almost certainly the same story, told from different angles.

The shared biology: androgens, insulin resistance, and connective tissue

Right. The mechanism bit, and some patience is needed here, because the science is genuinely interesting but also almost entirely mechanism level rather than clinical outcome level. Most of what follows is cell, tissue, or laboratory work, with a couple of clinical cross sections, and none of it has been done in a hypermobile PCOS or PMOS cohort yet. Treat it as a plausible biological story that maps onto what we observe in practice, not as a clinical claim.

The androgen and insulin feed forward loop

The metabolic part of PMOS isn’t decorative. Androgen excess directly impairs insulin signalling in muscle, fat, and liver, which raises insulin, and high insulin then raises androgen production further [7]. A feed forward loop, and it’s been the central pathophysiological model in the better mechanism reviews for years [7].

When it comes to the body weight question, a 2026 study of roughly three hundred women with PCOS, splitting them by hyperandrogenic versus non-hyperandrogenic phenotype, made the point bluntly: insulin resistance independently predicted the high androgen presentation, even after controlling for body weight [8]. Read that again, because it matters. Weight isn’t the gatekeeper it’s been treated as when it comes to who gets the metabolic side checked. That matters enormously for hypermobile women who are often slim, often told they “don’t look like” they’d have a metabolic problem, and under screened for the metabolic side of things as a result. For more on how the metabolic side intersects with day to day choices, our piece on [diet and metabolic considerations in hypermobility](https://www.thefibroguy.com/blog/hypermobility-diet/) goes further.

So, the question I get fairly regularly, “do I even need to think about insulin resistance if I’m not overweight?”, keeps getting answered the same way: yes. The 2026 data lines up with the broader PMOS literature [8], [7], and it also lines up with what we see in the studios. Slim hypermobile women with fatigue, cycle chaos, brain fog, and joint flares, when they finally get the metabolic markers checked, are sitting on insulin and androgen patterns nobody had bothered to chase.

What androgens might do to connective tissue

The dose specifics matter here, so we slow down a bit on this one.

In laboratory work on human fascial cells, dihydrotestosterone applied at female level concentrations shifted the collagen ratio: collagen I rose from about 2% to nearly 5% of cell area, while collagen III dropped from roughly 10% to 3% [16]. At male level concentrations, the effect blunted [16]. Striking finding, but the scope caveat is non negotiable, because these were cultured fascial cells from mixed sex, non hypermobile donors, which makes this mechanism evidence rather than clinical evidence. We can’t say it explains joint symptoms in PCOS or PMOS, because that experiment hasn’t been done in the right population.

Collagen I is the stiffer, load bearing fibre, and collagen III is the more elastic one, so a shift toward more I and less III is a shift toward a stiffer, less elastic tissue. In a healthy woman that might mean very little, but in a hypermobile woman whose connective tissue is already structurally different, the question of what elevated androgens might do at the tissue level is at least worth asking.

The same research group has shown, in further laboratory work, that fascial collagen ratios shift across hormone concentrations matching menstrual cycle phases [17], [18]. At low oestrogen, the stiffer collagen I rises and the more elastic collagen III plus elastic fibres fall [18]. Around the ovulatory peak the pattern reverses, with stiffer collagen I dropping back, moving the tissue toward a softer baseline [18]. Again, in cell studies, not in women in clinic, but the directional signal is there.

Why does the fascia care about hormones at all? Because the receptors are there. Tissue work has shown that human fascial fibroblasts express oestrogen, relaxin, and androgen receptors, with expression lower in postmenopause [19]. That’s a direct biological route for hormonal effects on connective tissue, and while it doesn’t tell us what happens under chronic hyperandrogenism specifically, it confirms the machinery is in place for hormones to act on fascia in the first place.

Tendon, inflammation, and metabolic syndrome

Tendon work mostly comes from animal research and pharmacological doses, so we’re careful here. A 2018 review of tendon remodelling drawing on animal work concluded that anabolic androgens alter tendon collagen turnover [20], but the doses studied are pharmacological rather than physiological, and that hedge matters. Endogenous PMOS hyperandrogenism isn’t pharmacological, so while the mechanism is suggestive, you can’t read across from a male rat on injected steroids to a woman with PMOS.

What translates better is the metabolic inflammation story. Reviews of obesity, metabolic syndrome, and musculoskeletal disease describe chronic low grade inflammation from insulin resistance as a contributor to tendinopathy, muscle loss, and pain [21]. PMOS, by its new framing, is a metabolic condition, and the bridge between insulin resistance and musculoskeletal misery isn’t speculative, it’s well described in the literature [21]. If pain management is where you’re stuck, our piece on [what pain medication actually does for hypermobility and EDS](https://www.thefibroguy.com/blog/pain-medication-for-hypermobility-and-eds/) gets into what the evidence shows is helpful and what isn’t.

So when women with a PMOS picture keep turning up at our studios with stubborn tendon irritation, niggling joint pain that won’t shift, and a fatigue floor that feels metabolic, the inflammation and insulin angle is the most defensible mechanistic thread we’ve got.

Honest scope flag

None of the connective tissue work above has been done in human hypermobile tissue under chronic PMOS hormonal conditions. The model is this: hypermobile women already have altered connective tissue biology, and PMOS adds chronic hyperandrogenism, chronic insulin resistance, and chronic low grade inflammation on top, with the mechanistic literature suggesting all these inputs act on the same tissue systems. A reasonable biological story, but not a tested clinical mechanism in hEDS or HSD.

What does that mean in practice for a woman sitting at home with a PMOS file and a hEDS diagnosis? The metabolic side of PMOS matters for her connective tissue, even if no study has yet measured the specific interaction. The insulin resistance to inflammation route to musculoskeletal pain is the strongest evidence based bridge [21]. The androgen to fascia route is plausible at the mechanism level but not clinically tested [16], [20]. The cycle linked laxity story is real in the female athlete literature, with one small pilot suggesting it’s more pronounced in those with hypermobility markers [22], [23], [24]. Treat the metabolic side seriously, and don’t read too much into the fascia mechanism story until it’s been done in the right population.

Symptom overlap: pain, fatigue, mood, sleep

The biology is interesting, but the day to day symptom overlap is where it bites, and this is the part that lands most heavily with clients.

Pain in PMOS

Pain is more common in PCOS than the textbooks suggest. A large analysis of US electronic health records, still a preprint so flag the caveat, reported clinically coded pain in roughly one in five women with PCOS overall, with the figure climbing closer to one in three among Black or African American and white women [25]. The preprint status matters, but what’s interesting about the finding is that the historical narrative hasn’t framed PCOS as a pain condition at all, and with the rename and the metabolic reframing, that’s likely to shift [3].

The mechanism story for pain in PMOS pulls from the central sensitisation literature plus the metabolic inflammation thread. Reviews of metabolic syndrome describe insulin resistance as feeding chronic low grade systemic inflammation, which in turn contributes to tendinopathy and other musculoskeletal pain through shared inflammatory pathways [21]. Layer that on a hypermobile nervous system that already has its own sensitisation story, and you’ve got two pain amplifying loops running in the same person at the same time.

Fatigue and the sleep piece

Sleep is one of the most under appreciated PMOS problems, honestly. Reviews of PCOS and sleep report a substantially elevated risk of obstructive sleep apnoea (OSA, where breathing repeatedly stops during sleep), and the elevation holds up even after controlling for body weight [26]. Reviews also flag heavier daytime sleepiness in women with PCOS, again independent of weight [27]. A 2024 study of around three hundred women with PCOS found roughly a third screened high risk for sleep apnoea on a standard questionnaire, with the risk tracking blood sugar control, inflammation markers, and a hormone binding protein called SHBG, where lower SHBG levels meant higher risk [28]. For the broader picture of how sleep falls apart in hypermobile bodies, our full [sleep and hypermobility guide](https://www.thefibroguy.com/blog/hypermobility-and-sleep/) covers the architecture, the dysautonomia piece, and what helps.

A 2022 meta analysis pooling multiple studies confirmed the picture: women with PCOS had measurably worse sleep quality, more daytime sleepiness, more breathing disruption overnight, and lower sleep efficiency than control groups [29]. Consistent signal across the pooled data [29].

The hypermobility crowd has its own sleep problem, because POTS interrupts the night with positional symptoms, dysautonomia plays havoc with thermoregulation and heart rate, and joint pain breaks deep sleep. Stack OSA risk on top of all that, and you’ve got a sleep picture that’s genuinely hard to fix without targeting all of it simultaneously. The honest gap is that nobody’s run a sleep study on a dual PMOS plus hypermobile sample, but the convergence of two sleep disrupting conditions in the same body is a clinical observation that’s hard to argue with. Cognitive impact is part of this picture too, which we’ve covered in [brain fog in EDS, POTS, and Long COVID](https://www.thefibroguy.com/blog/brain-fog-in-eds-pots-and-long-covid-causes-and-practical-ways-to-cope/).

Studio observation, for what it’s worth. The hypermobile clients we work with who get a PMOS or PCOS diagnosis added to their file almost universally describe the fatigue as a different texture from POTS fatigue, deeper, slower to lift, less responsive to electrolytes and posture work, and more responsive to sleep optimisation and metabolic work. That’s not a controlled study, it’s pattern recognition, and you can take it for what it’s worth.

Mood, anxiety, and body image

Depression is the most commonly reported psychiatric comorbidity in PCOS, and while rates vary widely across studies and populations, the consistent finding is that women with PCOS carry a much higher risk than women without it, with reviews putting the increase several times over [30]. A 2025 neuroendocrinology review describes PMOS related depression as having specific biological drivers, including androgen exposure, stress hormone dysregulation, gut microbiome changes, and chronic inflammation, that are distinct from depression in the general population [31]. Reviews of PCOS consistently report heightened anxiety, depression, eating disorders, and reduced quality of life, with mechanisms spanning body image, infertility distress, androgen effects, and stress hormone function [32]. A 2024 review described mood disorders, anxiety, eating disorders, and cognitive complaints in PCOS alongside specific brain activity alterations, with marked reductions in quality of life [33].

Now stack that on the hypermobility mental health load already there. A 2026 German EDS clinic study of just under a hundred people found around eight in ten reporting moderate to severe mental health burden, with most screening positive for clinically meaningful depression and nearly half for clinically meaningful anxiety [34], and roughly six in ten carrying a lifetime psychiatric diagnosis. The mechanism side of [why hypermobility and anxiety tend to travel together](https://www.thefibroguy.com/blog/hypermobility-and-anxiety-why-your-body-is-wired-for-it-and-what-to-do/) is worth a read if you’re trying to make sense of a mood and joint picture that doesn’t add up.

Two diagnoses, two independent mood loads, added together in the same person. The dual diagnosis additive piece hasn’t been formally quantified, but the convergence isn’t subtle.

Cognitive symptoms and brain fog

The cognitive piece deserves its own paragraph. Brain fog isn’t a recognised diagnostic feature of PCOS or PMOS, but it shows up in the symptom lists women bring to us. The underlying mechanisms, including insulin resistance affecting glucose handling in the brain, chronic low grade inflammation, disrupted sleep, and mood load, all sit in territory the literature has covered for adjacent conditions [21], [31]. Hypermobile women with POTS already deal with cognitive impact from cerebral blood flow shifts when standing, and when you layer PMOS related insulin resistance and sleep disruption on top, the cognitive picture often gets worse rather than better. Gut symptoms also overlap heavily in this population, which we’ve covered in [the hypermobility and constipation overlap](https://www.thefibroguy.com/blog/hypermobility-eds-constipation/).

Gut symptoms deserve a mention too. Constipation, bloating, and gut motility issues are well represented in hEDS cohorts, and the gut microbiome is one of the proposed contributors to the PCOS related depression picture [31]. The dual diagnosis gut story hasn’t been published, but the overlap is hard to miss in practice.

The summary picture

What hypermobile women with PMOS describe to us in the studios isn’t a coincidental cluster. Pain that doesn’t behave like simple joint pain, fatigue that doesn’t lift with rest, sleep that breaks for multiple reasons, mood pulled in several directions at once, and a cognitive load that compounds the other three. The mechanism stories sit underneath, the clinical observation matches, and the formal dual diagnosis prevalence work is still missing.

Hormonal cycling and joint stability

This section exists because hypermobile women have been telling us, for years, that their joints behave differently across the cycle, and the literature has finally caught up enough to say something useful.

The bulk of the cycle and laxity literature has been done in mainly non hypermobile female athletes and dancers, so we’re extrapolating, but the mechanism work and the population studies line up in the same direction.

A 2026 systematic review of 17 studies on female athletes reported the pre ovulatory and ovulatory phases as linked to greater knee laxity and elevated ACL injury risk, mediated by reduced passive stability and impaired neuromuscular control [22]. An earlier 2017 systematic review of menstrual cycle effects on lower limb biomechanics concluded ACL injury risk peaks in the pre ovulatory phase via a combination of greater laxity and altered knee mechanics [35]. A 2019 review of oestrogen’s musculoskeletal effects describes a dual pattern: oestrogen increases muscle mass and strength, but in ligament and tendon it reduces stiffness and increases laxity [24]. That dual pattern is important because it means the same hormone has opposite effects on the two tissues that need to coordinate to keep a joint stable. For the broader piece on [why traditional strength training falls short for hypermobile bodies](https://www.thefibroguy.com/blog/hypermobility-and-exercise-part-1/), that’s where the loading principles get broken down properly.

Relaxin biology pulls in a similar direction. Reviews of relaxin show its receptors are present in hip and knee joints, and relaxin activates matrix metalloproteinases that degrade collagen, providing a plausible mechanism for cycle linked tissue vulnerability [36]. Relaxin peaks mid luteal in a normal cycle [36], so in a typical ovulatory cycle you’ve got one window of high oestrogen near ovulation pushing ligament laxity up, then a mid luteal relaxin window doing the same thing through a different route.

Now to the hypermobility relevant bit. A small Japanese laboratory study of 15 young women, pilot level, found no overall cycle effect on anterior knee laxity across the group [23], but within the sample, the subset of women with genu recurvatum, which is a marker of hypermobility, showed significantly greater anterior knee laxity at ovulation [23]. Sample size means this is signal, not certainty, but the direction is consistent with the broader cycle literature, and it suggests hypermobile women may carry more cycle linked laxity than the general female population [23].

Work in female contemporary dancers, with cycle phase tracked by basal body temperature and LH surge kit, found no overall difference in musculoskeletal flexibility across follicular, ovulatory, and luteal phases, but within-cycle changes in oestrogen and relaxin correlated with greater musculoskeletal compliance and progesterone correlated with increased muscle stiffness [37]. Dancers as a population probably enrich for hypermobility even though they weren’t formally screened for it, so the dancer finding is suggestive in our direction [37].

The PMOS twist

This is the bit nobody’s written up properly. In a normal cycle, the luteal phase brings progesterone and relaxin peaks, then a withdrawal that triggers menstruation. In anovulatory PMOS, the luteal phase is often absent or blunted because ovulation didn’t happen [2]. So the normal relaxin and progesterone rhythm doesn’t run, and chronic hyperandrogenism sits on top of chronic low grade oestrogen exposure rather than the cyclical peak and trough pattern that drives the laxity changes described above [1], [2].

What does that mean for joint stability? Honestly, we don’t know. Could mean the cyclical laxity issue described in non PMOS women is less of a problem, because the cycle isn’t cycling in the usual way. Could mean the chronic hormone baseline creates a different tissue state altogether. The mechanistic fascia work suggests chronic hyperandrogenism might shift collagen ratios toward a stiffer baseline [16], while a chronic low oestrogen state would shift fascia in the same direction [17], and when you combine that with hypermobile connective tissue biology the prediction is genuinely messy. Nobody’s done the cycle laxity study in a PMOS plus hypermobile sample [22], [23], and if you’re heading into the next chapter of hormonal change, our piece on [menopause, perimenopause, and hypermobility](https://www.thefibroguy.com/blog/menopause-perimenopause-hypermobility-eds/) walks through what shifts and what to do about it.

What we tend to find with hypermobile women working through PMOS symptoms is that the symptom variability across the cycle is less predictable than in non PMOS hypermobile clients. Some report flatter symptoms across the month, no cyclical worsening but a higher baseline, while others report unpredictable flares that don’t track with any cycle phase. Pattern recognition, again, not controlled data, but worth saying out loud.

Exercise and rehab: how the standard PMOS prescription needs adapting

On exercise prescription, the PCOS literature is actually in decent shape. A 2022 meta analysis pooling 18 trials and nearly 600 women showed exercise meaningfully improved cardiorespiratory fitness and waist circumference in PCOS [38]. A 2020 systematic review found moderate certainty evidence that aerobic exercise reduces body weight in PCOS, with weaker evidence for reproductive outcomes [39]. A 2025 trial reported that combining resistance and endurance training in women with PCOS improved blood sugar control, insulin sensitivity, and the wider cholesterol picture, and reduced inflammation and androgen markers [40]. Systematic reviews of exercise and hormones in PCOS point to vigorous aerobic exercise and resistance training as the most consistent ways to improve insulin sensitivity and reduce androgens [41]. Recent reviews conclude that aerobic, resistance, interval, and combined protocols all benefit PCOS metabolic and reproductive markers, with combined training providing the broadest effect [42].

Right, so the headline isn’t subtle: exercise works for PMOS, and combined aerobic and resistance training has the most consistent support across recent reviews for cardiometabolic and reproductive outcomes [42].

Here’s the catch. None of those trials screened for hypermobility, so when a PMOS guideline points at “vigorous” aerobic work, high impact loading, and ballistic protocols, it’s pulling from data that didn’t include the population we work with [38], [41]. The metabolic mechanism isn’t wrong, it’s the same in a hypermobile body as in a non hypermobile one, but what changes is the implementation. The motor control side of why hypermobile bodies need a different approach is covered in [proprioception, brain maps, and why hypermobile bodies feel lost](https://www.thefibroguy.com/blog/hypermobility-and-exercise-part-2-cortical-maps-and-proprioception/).

What we actually see is this. Women who plough into a “vigorous PCOS exercise plan” off the internet, when they’ve got undiagnosed or partially managed hypermobility, end up flared, injured, demoralised, or all three. We’ve had clients walk in pre flared from a six week running build, and others from a CrossFit foundations programme that defaulted to box jumps and ballistic loading, not because the prescription was wrong in principle but because it wasn’t tailored to the connective tissue picture underneath.

Principles for hypermobile women working with a PMOS picture

In practice, the adjustments we make in our studios are these, and none of them contradict the PMOS exercise evidence, they just specify the how.

First, build motor control and joint co activation before adding speed or load. Hypermobility doesn’t mean weakness, but the nervous system’s map of where the joints are sitting often needs work before adding velocity, because velocity without control is where joints end up at the wrong end of range. The other side of that coin is [fear of movement in hypermobility and EDS](https://www.thefibroguy.com/blog/fear-of-movement-in-hypermobility-and-eds-what-it-is-why-it-happens-and-what-actually-helps/), which has to be addressed in parallel.

Second, manage range of motion actively rather than relying on passive end range. The hypermobile joint already has the range, what it needs is the capacity to control the range, and static stretching toward end range, beloved of generic flexibility advice, is mostly the wrong direction. Strength through full range is the better target.

Third, use compound, controlled tempo loading. The metabolic returns shown across PCOS exercise reviews are most consistent when resistance training is paired with aerobic work [42], and resistance training delivers those returns whether you’re loading at a controlled tempo or hammering it on a barbell. For hypermobile bodies the controlled tempo route, with longer time under tension, gets the metabolic adaptation without the joint risk of ballistic loading.

Fourth, avoid ballistic plyometric work as a default starting point. Plyos are a tool and they have a place, but not as an entry point for someone whose joint stability is already a moving target. Build the base first.

Fifth, cycle load, not just calories. Load tolerance varies with sleep, hormones, and inflammation, and hypermobile bodies don’t respond well to a fixed plan run rigidly for twelve weeks regardless of how the person is feeling that week. The PCOS exercise evidence supports a range of intensities and protocols, so flexing load around how the body is responding is well within what the literature backs [42].

Sixth, respect rest and adaptation from a metabolic perspective, not just a muscular one. The PMOS picture brings elevated inflammatory markers, disrupted sleep architecture, and a baseline metabolic stress that interacts with training stress in ways that aren’t always intuitive [21], [29]. Two hard sessions back to back, which a body without hypermobility or PMOS might absorb fine, can stack into a flare that takes a week or two to settle. We programme rest days as deliberately as we programme training days, and the women who buy into the rest day discipline early make more progress in the whole process than the ones who push through.

Seventh, screen for OSA if symptoms warrant it. Daytime sleepiness, witnessed apnoeas, morning headaches, and persistent fatigue despite good sleep hygiene all warrant a conversation with the GP about a sleep study [26], [28], because untreated OSA undermines every training and metabolic adaptation you’re trying to build. The week to week management of load and energy is where [pacing for chronic pain and EDS](https://www.thefibroguy.com/blog/pacing-for-fibromyalgia-eds-chronic-pain-the-complete-evidence-based-guide/) becomes essential.

On modalities, swimming and cycling deliver the cardiometabolic load with less joint impact than running, which matters in the early phases of building tolerance. Walking is underrated, honestly. Long, steady walking shifts insulin sensitivity, doesn’t tax joints, and is something hypermobile women with PMOS can generally do without flaring.

Resistance training, for our money, is the most important single piece. Recent PCOS exercise reviews put combined aerobic plus resistance training as the protocol with the broadest cardiometabolic and reproductive returns [42], and for hypermobile bodies, resistance work also drives the joint control and motor mapping changes that everything else depends on. Progressive overload, controlled tempo, full range under load. That’s the spine of the programmes we run in our studios, and it’s the same spine whether or not a PMOS picture is part of the story.

The bit we want clients to leave with is this. The metabolic mechanism that makes exercise work in PMOS is the same mechanism that needs to work in your body. Not “don’t exercise because you’re hypermobile”. Instead: load well, build the base, train your nervous system to control the range, and treat the metabolic side seriously. Educational framing, not a treatment claim.

What this changes in practice

Pulling the threads together, and being honest about what’s changed and what hasn’t.

The diagnostic path hasn’t changed. Rotterdam criteria still apply [2], AMH is still allowed as an alternative to ultrasound in adults [2], and two of three out of hyperandrogenism, ovulatory dysfunction, and polycystic ovarian morphology still defines the syndrome [2]. The 2023 International Evidence based Guideline, developed across 39 organisations and 71 countries, remains the standard until the 2028 update [2], [1].

The treatment path hasn’t changed either. Lifestyle first line, letrozole first line for ovulation induction, and psychological screening mandated at diagnosis [2]. For how we think about the EDS side specifically, [how we approach EDS rehab](https://www.thefibroguy.com/ehlers-danlos-syndrome/) lays out the broader framework.

The framing has shifted, and that’s the whole point. The rename pushes clinicians and women toward thinking metabolic and hormonal management, rather than treating the condition as if it’s fundamentally about cysts [1], [3]. That matters, because where you think the disease lives shapes what you screen for, what you treat, and what you take seriously.

For hypermobile women in particular, the shift toward a metabolic understanding of PMOS means the insulin resistance and androgen pieces aren’t optional add ons to the conversation anymore, they’re central [3], [8]. And because the metabolic mechanism is independent of weight, slim hypermobile women shouldn’t get filtered out of the screening conversation by a thin BMI [8].

One practical note: keep your medical team in the loop on the rename. Records will need to align over the three year transition window, and if you’re moving between specialists or geographies, having both PCOS and PMOS in your file avoids future confusion [1]. Don’t expect overnight uptake from clinicians. The transition window is there precisely because these things take time in clinical practice.

Shared management priorities

For PMOS plus hypermobility, the priorities we’d put on the table, evidence wise, are these.

Sleep comes first. OSA risk is real, fatigue burden is real, and the gains from getting sleep right ripple into everything else [26], [29]. For the autonomic side of the sleep and stability picture, [compression garments for hypermobility, EDS, and POTS](https://www.thefibroguy.com/blog/compression-garments-hypermobility-eds-pots/) is worth a look.

Strength based rehab over passive stretching. The cardiometabolic returns in PCOS are well documented for both aerobic and resistance training, with combined protocols showing the broadest benefits [42], and the joint control gains are in active loading, not passive end range work.

Lifestyle interventions are evidence based for both conditions independently. The PMOS guideline calls for it [2], and the hypermobility literature agrees on loading principles.

Mental health screening at diagnosis. Mandated for PMOS [2] and well established as needed in hEDS and HSD [34]. The piece on [the hypermobility and anxiety connection](https://www.thefibroguy.com/blog/hypermobility-and-anxiety-why-your-body-is-wired-for-it-and-what-to-do/) covers the mechanism side.

Pain management that respects central sensitisation rather than amplifying it through fear avoidance or over investigation. The medication side is broken down in [what pain medication actually does for hypermobility and EDS](https://www.thefibroguy.com/blog/pain-medication-for-hypermobility-and-eds/).

PCOS, now PMOS, is increasingly framed as a lifelong multisystem condition with familial endocrine and metabolic clustering and major implications for type 2 diabetes and cardiovascular risk later in life [43]. A Finnish birth cohort study followed women with PCOS and matched controls out to age fifty, and the PCOS group carried noticeably higher overall diagnosis rates and medication use [44]. Elevations spanned endocrine, metabolic, nervous system, musculoskeletal, and genitourinary categories, and some held up even in lean women [44]. That’s a long view that, in our experience with hypermobile clients, the day to day management often forgets. Fatigue, often the loudest day to day complaint, has its own physiology, which we’ve covered in [the breathlessness, fatigue, and chronic pain link](https://www.thefibroguy.com/blog/the-missing-link-between-breathlessness-fatigue-and-chronic-pain-understanding-co%E2%82%82-tolerance/).

Where the research is still missing

The honest picture is more useful than a tidy one. Here’s where the formal evidence actually stops.

There’s no direct prevalence study of PMOS in hEDS or HSD cohorts. Plenty of hEDS gynaecological data [11], [12], [13], [14], [15]. Plenty of PMOS data in general populations [2], [1]. Nothing that’s measured the rate of one inside the other, and that gap matters enormously for clinical decisions.

There’s no exercise study run specifically in a PMOS plus hypermobility sample. The PCOS exercise evidence is strong [38], [39], [40], [41], [42], but none of it screened for hypermobility, so the adaptation principles above are extrapolated from broader exercise science and clinical observation, not from a hypermobility specific trial.

There’s no cycle laxity study in PMOS. The female athlete cycle and ACL literature is detailed [22], [35], [24], and the hypermobility specific pilot is small [23], but nobody has combined the two populations [22], [23].

There’s no androgen receptor study in human hypermobile connective tissue. The Italian fascia group has done the cell and tissue work in non hypermobile donors [16], [19], [18], but nobody has repeated it in hEDS tissue under PMOS hormonal conditions.

There are no longitudinal outcomes studies for women living with both conditions. The Finnish PCOS birth cohort gives us a long view in PCOS [44], and the hEDS multisystem burden data gives us a young adult snapshot [10], but nobody has joined them.

These are the missing pieces. If you’re a researcher reading this and you happen to have a hypermobility cohort with reproductive endocrine data, please publish it. The clinical community could use it.

In the meantime, the practical posture for women living at this intersection is to take both conditions seriously and to hold the medical team to a joined up conversation. The PMOS literature is moving fast, and the rename itself is the proof of that. The hypermobility literature has, in the last few years, finally started talking to the rest of medicine rather than sitting in its own corner [9], [34], and the two streams are going to converge. They just haven’t yet, in the formal published sense.

The bottom line

The rename is real. PCOS is PMOS, and the science underneath the new label is being reframed around metabolic and hormonal drivers rather than ovarian morphology [1], [3]. That reframing is welcome.

For women with hypermobility, the overlap is plausible, clinically observed, mechanistically grounded, and not yet quantified in a single dual diagnosis study. The fascia and androgen mechanism work sits in laboratory studies [16], [17], [19], [18]. The cycle laxity work sits in mainly non hypermobile female athletes and dancers [22], [23], [35], [24], [37]. The pain, fatigue, sleep, and mood overlap is real and additive [25], [30], [26], [29], [34], [33]. The prevalence study that would tie it all together hasn’t been done. If you want structured rehab in your own time, [our online courses](https://www.thefibroguy.com/courses/) cover the loading, motor control, and self management work in a guided format.

What can hypermobile women with a PMOS diagnosis, or a strong suspicion of one, do today? Same thing that works for either condition on its own. Take it seriously, load well, sleep well, screen for mental health, and treat insulin resistance like it matters regardless of whether your BMI is “normal”. Manage pain without amplifying it, and don’t accept “it’s just your hormones” as a clinical end point.

The Fibro Guy team works with hypermobile women, including many with PMOS or PCOS in their file. We don’t diagnose PMOS, that’s the GP and the endocrinologist’s job. What we do is help women rebuild strength, joint control, and confidence through structured rehab, in our studios and through our online programmes. We welcome the rename, because it forces a more useful conversation than “your ovaries have cysts”, which often wasn’t even true [1], [2], [4]. If you’d rather work with the team directly, our [in-studio sessions](https://www.thefibroguy.com/studio/) are how we deliver one to one rehab.

If you’re hypermobile, and you’ve got a PCOS or now PMOS label sitting alongside your hypermobility diagnosis, and nobody’s joined the two stories up for you yet, then this is your nudge. Start asking the joined up questions. The literature’s closer to catching up than it’s ever been [1], [3], [8].

The hypermobility community has spent years being told its symptoms are vague, its conditions are rare, and its presentations don’t fit neatly into the boxes the medical system has built. The PMOS rename, in a small way, is the opposite story: a condition that’s been squeezed into a too neat box for decades has finally been let out of it, by an enormous international consensus that admits the old framing was misleading [1], [5], [3]. If a condition affecting roughly 1 in 8 women can be renamed because the name was wrong [1], [2], the same intellectual honesty applies to conditions where the name hasn’t been challenged yet. Don’t let outdated terminology shape clinical care if the science has moved past it.

FAQ

What does PMOS stand for?

PMOS stands for Polyendocrine Metabolic Ovarian Syndrome. It’s the new name for what used to be called PCOS, announced on 12 May 2026 at the European Congress of Endocrinology in Prague and published in The Lancet [1]. “Polyendocrine” because more than one hormone axis is involved. “Metabolic” because insulin and glucose handling are central. “Ovarian” because the location still matters, even if cysts aren’t required for diagnosis. “Syndrome” because, well, that part stays [1], [3].

Is PCOS or PMOS more common in EDS and hypermobility?

The honest answer is that no direct prevalence study of PCOS or PMOS in a hypermobile cohort has been published. What we do know is that gynaecological pathology is over represented in EDS and HSD populations, with rates of ovarian cysts, painful periods, endometriosis, and pelvic pain elevated in multiple cohorts [11], [12], [13], [15]. We also know that the endocrine disease burden in hEDS is elevated against general population controls [10]. The overlap is plausible and clinically observed, but the formal prevalence number isn’t on the page yet.

Should I exercise differently if I’m hypermobile and have PMOS?

The metabolic mechanism is the same. The implementation should differ, and the PCOS exercise evidence supports combined aerobic and resistance training as the protocol with the broadest cardiometabolic and reproductive benefit profile [42]. For hypermobile bodies, the adjustments are practical: build joint control before adding load and speed, use controlled tempo resistance training rather than ballistic plyometric work as a starting point, manage range actively, and cycle load around how you’re feeling that week. Educational framing: this is about how, not whether.

Will my diagnosis change with the rename?

Diagnostic criteria haven’t changed. Rotterdam criteria stay. Two of three out of hyperandrogenism, ovulatory dysfunction, and polycystic ovarian morphology, with AMH allowed as an alternative to ultrasound in adults [2], [1]. Treatment recommendations haven’t changed either [2], [1]. What’s changing is the label and the framing. There’s a three year transition aligned to the 2028 International Guideline update and the ICD-11 alignment that follows [1], so your records will gradually shift over that window.

Does PMOS mean my joint symptoms are because of my hormones?

It’s complicated. Hormonal fluctuations affect connective tissue at the receptor and collagen ratio level in cell and tissue studies [16], [17], [19], [18]. The female athlete literature shows cycle linked laxity changes [22], [35], [24]. A small Japanese laboratory study suggested women with hypermobility markers carry more cycle linked laxity than non hypermobile peers [23]. But hormones aren’t the whole story. Joint symptoms in hypermobility involve nervous system mapping, strength, sleep, pain processing, and inflammation [21]. PMOS, with its chronic metabolic and hormonal picture, may shift the baseline rather than drive a pure cyclical pattern. The honest position is: hormones contribute, they aren’t the entire explanation, and the dedicated research in a PMOS plus hypermobility population hasn’t been done.

References

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