Children's Hospital Colorado
Gynecology

Polyendocrine Metabolic Ovarian Syndrome (PMOS)

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What is polyendocrine metabolic ovarian syndrome (PMOS)?

Polyendocrine metabolic ovarian syndrome (PMOS), formerly known as polycystic ovary syndrome (PCOS), is a health issue that can affect females starting at puberty.  This condition occurs when females have extra testosterone in their body. That increased testosterone can affect the menstrual cycle, hair growth, skin, weight, the risk for metabolic conditions like Type 2 diabetes or liver inflammation and the ability to have children.

Children’s Hospital Colorado was part of the international team of experts who renamed the syndrome to PMOS in 2026 to help improve understanding, diagnosis and care for adolescent patients. The former name, PCOS, refers to the cyst-like appearance of excess egg follicles in the ovaries. But because they are not actually cysts, the name PCOS was confusing and didn’t best reflect what the condition encompasses. Researchers now know that PMOS has full-body impact and affects much more than just the ovaries. It also plays a major role in metabolic, reproductive and mental health.

What causes polyendocrine metabolic ovarian syndrome (PMOS)?

PMOS occurs when testosterone levels are higher than normal, and there are many reasons this might occur. Researchers continue to explore the various causes of higher testosterone levels.  Most often, PMOS is linked to genetic factors (factors inherited from parents) as well as high insulin levels. More than half of those with PMOS have family members with either PMOS or Type 2 diabetes.

New research suggests that many patients with PMOS are less sensitive to insulin, which is called insulin resistance. As a result, the body may produce higher levels of insulin. Genetic factors can make the ovaries more sensitive to higher insulin, which causes them to produce more testosterone.

Who gets polyendocrine metabolic ovarian syndrome (PMOS)?

Any female with normal ovaries is at risk for PMOS. Genetics play a role in causing PMOS, but the condition is also caused by high insulin and other factors that researchers have not yet discovered.

How common is PMOS?

About 10-15% of all women have PMOS.

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Get to know our pediatric experts.

Stephen Scott, MD, MPH

Stephen Scott, MD, MPH

Ob/Gyn Obstetrics & Gynecology

Tricia Huguelet, MD

Tricia Huguelet, MD

Ob/Gyn Obstetrics & Gynecology

Veronica Alaniz, MD, MPH

Veronica Alaniz, MD, MPH

Ob/Gyn Obstetrics & Gynecology