PCOS, PCOD and PMOS: what's the difference?
The short answer
PCOS and PMOS are the same condition. In May 2026, polycystic ovary syndrome (PCOS) was renamed polyendocrine metabolic ovarian syndrome (PMOS) after a global process involving more than 50 patient and medical organisations. PCOD (polycystic ovarian disease) is a term used mostly in South Asia, including Nepal and India. It isn’t a separate diagnosis in international guidelines, which describe one condition. Some sources, such as UNICEF India, use PCOD for a milder form.
Why PCOS was renamed PMOS
The old name suggested the problem was cysts on the ovaries. According to the Endocrine Society, that was misleading: there is actually no increase in abnormal cysts on the ovary. The “cysts” seen on ultrasound are small follicles, eggs that didn’t finish developing.
The new name describes what the condition really is:
- Polyendocrine: it involves several hormones, including androgens (“male” hormones that all women have in small amounts) and insulin.
- Metabolic: it affects how the body handles sugar and weight, with a higher long-term risk of type 2 diabetes.
- Ovarian: it affects ovulation and periods.
The change is being phased in over about three years, with full adoption planned for the 2028 international guideline update. Many doctors, labs and websites will keep saying PCOS or PCOD for a while. They all mean the same thing.
PCOD vs PCOS: where the confusion comes from
In Nepal and India you’ll hear “PCOD” as often as “PCOS”. Some hospital and health websites describe PCOD as a milder, mainly ovarian problem that often improves with lifestyle changes, and PCOS as a broader hormonal disorder. The WHO, the NHS and the international guideline use one name for one condition, with a wide range of how mild or severe it is.
What matters for you is not the label but the diagnosis, and that uses the same criteria either way.
How it’s diagnosed
According to the WHO, a doctor looks for at least two of these three:
- Signs of high androgens: extra facial or body hair, acne, oily skin, hair thinning on the scalp, or high testosterone on a blood test.
- Irregular or missing periods, a sign that ovulation isn’t happening regularly.
- Polycystic ovaries on an ultrasound.
Other causes, such as thyroid problems, need to be ruled out first. That’s why a blood test is usually part of the check.
How common is it?
The WHO estimates PMOS affects 10 to 13% of women worldwide, and that up to 70% of women who have it are undiagnosed. So if your periods are irregular and you have some of the signs above, it’s worth asking a doctor rather than guessing.
What helps
There is no cure, but symptoms can be managed. The NHS recommends eating a healthy, balanced diet, exercising regularly, and losing weight if you’re overweight, alongside medicines where needed. The WHO stresses that healthy eating and physical activity help even when they don’t lead to weight loss.
For food ideas built around a Nepali kitchen, read PCOS and Nepali food: a practical guide. For the basics, see PCOS basics.
What to track before seeing a doctor
- The first day of each period, for at least three cycles if you can
- How long each period lasts and how heavy it is
- Skin changes, acne or new hair growth
- Weight changes
A record of real dates makes the “irregular periods” part of the diagnosis much easier to discuss. Cycella keeps this history on your phone and can make a one-page doctor report.
Sources
- Endocrine Society — New name for PCOS: Polyendocrine Metabolic Ovarian Syndrome (May 2026)
- The Lancet — Polyendocrine metabolic ovarian syndrome, the new name for polycystic ovary syndrome (2026)
- WHO — Polycystic ovary syndrome (fact sheet)
- NHS — Polyendocrine metabolic ovarian syndrome (PMOS): treatment
- UNICEF India — Do PCOD and PCOS mean the same thing?
Try the Next period calculator, or see Cycella in Nepal. Cycella is a free, private Android period tracker, now on Google Play.
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