PCOS has a new name, PMOS. Here is what it means

Why polycystic ovary syndrome was renamed, what PMOS stands for, and what the change does and doesn’t mean for your diagnosis and care.

Last reviewed 16 October 2026Checked against the sources listed below

If you have polycystic ovary syndrome, or have been told you might, you may have started seeing a new name: polyendocrine metabolic ovarian syndrome, or PMOS. This guide explains what changed, why, and what it does and doesn’t mean for you. It is for anyone who has seen the two names side by side and wondered whether they are the same thing.

What changed, and when

In May 2026, The Lancet published the result of a multistep global consensus process that chose polyendocrine metabolic ovarian syndrome as the new name for polycystic ovary syndrome.^[1] The process involved academic, clinical and patient organisations, and the paper sets out a plan for moving health systems, education and disease classification over to the new name gradually rather than overnight.^[1]

Health services have started to follow. The NHS now describes the condition as PMOS and says plainly that it used to be called PCOS.^[2] It is the same condition with a new name, not a newly discovered one.

Why the old name had to go

“Polycystic ovary syndrome” describes the ovaries as full of cysts. The consensus paper says that name is inaccurate: it implies pathological ovarian cysts, which are not a core feature, while hiding the condition’s wide range of endocrine and metabolic features.^[1] The authors also link the old name to delayed diagnosis, fragmented care and stigma.^[1]

The new name tries to describe the condition by what it involves instead. “Polyendocrine” and “metabolic” reflect the hormonal and metabolic features the consensus says the old name obscured, and “ovarian” keeps the ovaries in the picture.^[1] It is a longer name, and PMOS is the short form most people will use.

What PMOS is

The symptoms the NHS lists include irregular periods, extra hair growth or hair loss, weight gain, oily skin and acne, difficulty getting pregnant, feeling very tired, and mental health problems such as depression or anxiety.^[2] Not everyone has every symptom, and some people have very few.

It is diagnosed by a doctor, usually with blood tests and an ultrasound scan alongside your symptoms and history.^[2] There is no cure, but treatments can help manage the symptoms.^[2] Which treatment makes sense depends on what bothers you most and whether you want to get pregnant, which is a conversation for your doctor.

What the new name means for you

• If you already have a PCOS diagnosis, you don’t need a new one. The condition is the same; only the label is changing.
• You will see both names for a while. Because the change is being phased in, some doctors, clinics, insurers, websites and medical records will say PCOS and others PMOS.^[1] If you are searching for information or support groups, try both.
• Ask if a document is unclear. If a letter or test result uses a name you don’t recognise, it is reasonable to ask your clinic whether it means the same condition.
• The name change is not a treatment change. Nothing in the renaming itself changes the care you are already getting. Any change to your treatment is something to discuss with your doctor.

What hasn’t changed

A new name doesn’t undo anything you already know. The results of tests you have had, the advice you have been given and the people who look after you are all still valid. If you have been living with the condition for years, you don’t need to start again: you can simply use whichever name the person in front of you understands, and expect both to be recognised during the changeover.

Tracking your cycle with PMOS

Because PMOS often brings long, unpredictable cycles, a record of your periods and symptoms is useful evidence to bring to appointments. Bloom keeps cycles up to 90 days long in your history, measures “late” against your own pattern, and lets you log symptoms and mood alongside your dates. It cannot diagnose PMOS, confirm whether you ovulated, or act as contraception. There is more on what tracking can and can’t do in tracking your cycle with PCOS (PMOS), and on unpredictable cycles in general in a period tracker for irregular periods.

Practical tips

• Write down both names in your own notes, so you can find old and new information.
• Keep a simple record of period start dates, how long each cycle was, and any symptoms that change. Months of dates are more useful to a doctor than memory.
• Ask what the new name means for you. At your next appointment, it is reasonable to ask whether the “metabolic” side of the condition changes anything you should keep an eye on.

Bloom is a wellness and planning app. It is not a medical device, it does not diagnose or treat any condition, and it is not a method of contraception. This page is general information, not medical advice. If something about your cycle worries you, talk to a doctor, nurse or midwife.