PMOS stands for Polyendocrine Metabolic Ovarian Syndrome. It is the newer consensus name for PCOS, previously known as Polycystic Ovary Syndrome. PMOS and PCOS refer to the same condition, not two different ones.
The name has changed because PCOS placed a lot of emphasis on ovarian cysts, even though not everyone with the condition has cysts. PMOS better reflects the wider hormonal, metabolic and ovarian features involved, rather than focusing on one physical sign.
PMOS can involve hormone imbalance, insulin resistance, irregular ovulation, changes in androgen levels and wider metabolic health. How it shows up varies from person to person, which is why personalised support is often helpful rather than a one size fits all approach.
Throughout this page, we use PMOS as the newer term while also referencing PCOS, since many people still know and search for the condition by its former name.