PMOS (PCOS)

What it is

Polycystic ovary syndrome (PMOS) is a common condition that affects how the ovaries work. It's linked to three main features: irregular periods (the ovaries don't regularly release eggs), higher levels of androgens (sometimes called "male" hormones), and ovaries that contain many small, fluid-filled sacs. A diagnosis is usually made when at least two of these three are present. PMOS affects an estimated 1 in 10 women.

Common symptoms

Symptoms vary widely, and often begin in your late teens or early twenties. They can include:

• irregular periods, or no periods at all
• difficulty getting pregnant
• excess hair growth, usually on the face, chest or back
• weight gain, or difficulty losing weight
• oily skin or acne
• thinning hair or hair loss from the head

Why diagnosis takes time

PMOS symptoms develop gradually and overlap with other conditions, so they're easy to miss or attribute to something else. There's no single test: a diagnosis usually involves a conversation about your symptoms, blood tests and sometimes an ultrasound, and ruling out other causes.

How tracking helps

Because PMOS is closely tied to your cycle, a record of when your periods come (or don't) and the symptoms around them can be genuinely useful. A Doctor's Report pulls this together into a clear summary you can share, so your appointment starts from real data.

Where to get support

• NHS: Polycystic ovary syndrome
• Verity (PMOS charity)

If you think you might have PMOS, speak to your GP.

Sister Health does not provide medical advice, diagnosis or treatment. Always consult a qualified healthcare professional. In an emergency, call 999 in the UK or 111 in New Zealand.