When. In May 2026, polycystic ovary syndrome was renamed Polyendocrine Metabolic Ovarian Syndrome, or PMOS.
Who. The change came from a global consensus process involving clinicians, researchers and patients, was announced to the public by the Endocrine Society, and now appears in draft clinical guideline documentation from the United Kingdom's National Institute for Health and Care Excellence.
Why. The old name centered ovarian cysts, which are not required for a diagnosis and were never the whole story. The new name names what the condition actually is, a hormone and metabolic condition. If you were diagnosed with PCOS, you have PMOS, and your care plan still stands.