Most women must have heard or been misdiagnosed with PCOS (Polycystic Ovarian Syndrome) at least once in their life. It is a term that is thrown around a lot when talking about irregular periods, acne and sudden weight gain in teens. But on the flip side, this term has been a misnomer all along. So in May 2026, PCOS was officially renamed as PMOS, which is Polyendocrine Metabolic Ovarian Syndrome and published in The Lancet. This marked a major paradigm shift  in understanding different factors that can possibly affect teens’ and women’s health worldwide. After a decade of research, 22,000 people joining for the cause and 56 organisations collaborating, the doctors got the name right and it is important to know why this change matters. 

The old name ‘PCOS’ was quite misleading. The name suggested the presence of pathological ovarian cysts, which are small, fluid-filled sacs that form inside or on the surface of an ovary due to hormonal imbalance that can cause an egg to not mature-up and get released. Many patients do not actually have ovarian cysts when facing symptoms of this condition, so ultimately the name started seeming wrong and confusing and this became a cue for doctors and researchers to change it. The difference that this change has made is that it acknowledges the full complexity of the condition. It recognises it as a whole body-multisystem condition which pools in endocrine, metabolic, reproductive, dermatological and physiological health, rather than viewing it only through the gynaecological perspective. 

The metabolic aspect of PMOS is really important. The majority of the women suffering from PMOS, with or without obesity, experience insulin resistance. This usually means that the body is struggling to use insulin and utilize glucose properly and can affect blood sugar levels, leading to risks like impaired glucose tolerance, high blood pressure, high cholesterol and even type 2 diabetes and heart diseases later in life. Hence inclusion of these symptoms mattered so much as the hormonal/endocrine imbalance in PMOS directly impacts processing of food and energy, leaving women struggling with weight gain even when they have a healthy lifestyle. The endocrine imbalance makes the metabolic problem even worse by producing high levels of androgens (male hormones) that not only contribute to this insulin resistance but causes secondary characteristics like facial and body hair growth, female pattern baldness and stubborn acne. The secretion of excess androgens covers the reproductive aspect of this condition as well. Because of the hormonal irregularities, women experience irregular or missed periods, difficulty getting pregnant and unpredictable ovulation. 

The definition of PCOS was too narrow and it overlooked so many other aspects that led to misdiagnosis. Since the name wasn’t descriptive enough, it caused misunderstandings and confusion, even in doctors, which further created stigma, delayed diagnosis and subverted treatments. But the good news is that patients and doctors were quite on board with this change since 86% of surveyed patients and 71% of healthcare professionals supported and recognized this change as more biologically accurate. Now clinical guidelines, medical education and international disease classification systems are being updated to ensure the new terminology is adopted consistently worldwide. A three-year transition period is supported by a major international education and awareness campaign reaching those affected, like health professionals, governments and researchers around the world, with the new terminology. With this name and better understanding, you're more likely to get diagnosed and treated properly instead of being told "it's just hormones", finally, a name that actually explains what's going on!