PCOS vs PCOD vs PMOS: What Is the Difference? (2026 Guide)

If you have searched for answers about irregular periods, acne or unexplained weight gain, you have probably seen three names: PCOS, PCOD and, more recently, PMOS. Websites often describe them as different conditions, which can be confusing and worrying.

The short answer: they all describe the same hormonal and metabolic condition. PCOS is the long-standing medical name, PCOD is the term widely used in India, and PMOS is the new official name announced in 2026. This guide explains where each name comes from, what the condition actually is, how it is diagnosed and what helps.

Quick answer: PCOS vs PCOD vs PMOS

	PCOS	PCOD	PMOS
Full form	Polycystic ovary syndrome	Polycystic ovarian disease	Polyendocrine metabolic ovarian syndrome
Who uses it	Doctors and guidelines worldwide (until 2026)	Mainly used in India, by patients and some clinics	The new official name from 2026 onwards
Separate disease?	No, same condition	No, same condition	No, same condition
Diagnosis	Two of three: irregular ovulation, high androgens, polycystic ovaries	Same	Same, criteria unchanged
Treatment	Lifestyle changes, plus medicines when needed	Same	Same

What is PCOS (polycystic ovary syndrome)?

PCOS is one of the most common hormonal conditions in women of reproductive age. Global estimates suggest it affects roughly 1 in 10 women, and Indian studies report figures ranging from about 1 in 10 to 1 in 5, depending on how it is measured. Many people go years without a diagnosis.

It is a syndrome, meaning a group of features that tend to occur together rather than one single cause. The three core features are:

• Irregular or absent ovulation, which shows up as irregular, infrequent or missing periods
• High androgens (male-type hormones such as testosterone), shown by acne, excess facial or body hair, scalp hair thinning, or blood tests
• Polycystic ovaries on ultrasound, meaning many small follicles on the ovaries

Despite the name, the “cysts” are not true cysts. They are immature follicles, egg sacs that started developing but did not mature and release an egg. They are not harmful in themselves and do not need to be removed.

Underneath these features, insulin resistance plays a big part for most people with PCOS, including those who are not overweight. High insulin pushes the ovaries to make more androgens, which in turn disrupts ovulation. This is why diet and exercise matter so much.

What is PCOD (polycystic ovarian disease)?

PCOD is an older term that remains very common in India. You will hear it from friends and family, see it on clinic websites, and often find it in search results alongside PCOS.

Many Indian websites say that PCOD is a milder condition in which “the ovaries release immature eggs”, while PCOS is a more serious “metabolic disorder”. This distinction is not used in international medical guidelines. There is no separate set of criteria for diagnosing PCOD, and the advice on managing it is the same as for PCOS.

If a doctor has told you that you have PCOD, it is reasonable to understand it as PCOS. Asking which features you have (irregular cycles, high androgens, polycystic ovaries, insulin resistance) is more useful than focusing on the label.

What is PMOS, and why was PCOS renamed?

In May 2026, an international consensus published in The Lancet announced that PCOS would be renamed polyendocrine metabolic ovarian syndrome (PMOS). The process was led by Professor Helena Teede at Monash University and involved patients, doctors and researchers from around the world.

The new name breaks down like this:

• Polyendocrine: the condition affects several hormone systems, including insulin, androgens and reproductive hormones
• Metabolic: it is closely linked with insulin resistance, weight, type 2 diabetes and heart health
• Ovarian: it affects ovulation and periods
• Syndrome: it is a group of features, not one disease with one cause

The main reasons for the change were that the old name focused on cysts, which many people do not have, and that it hid the hormonal and metabolic side of the condition. Experts hope the new name will lead to earlier diagnosis and better long-term care, such as regular checks for blood sugar and cholesterol.

What has not changed:

• The diagnostic criteria are the same
• The treatments are the same
• Research and advice about PCOS still applies to PMOS

The change is being phased in over about three years, with the new name expected to be fully adopted in the 2028 international guideline update. For now, you will see PCOS, PCOD and PMOS used side by side.

Symptoms of PCOS, PCOD and PMOS

Symptoms vary a lot between people. Some have only one or two, while others have many. Common signs include:

• Irregular periods: cycles longer than 35 days, fewer than eight periods a year, or periods that stop for months. Our guide to causes of irregular periods explains what counts as irregular.
• Acne, especially deep breakouts along the jawline, chin and neck
• Excess hair growth (hirsutism) on the face, chest, belly or back
• Thinning hair on the scalp
• Weight gain, especially around the waist, or finding it hard to lose weight
• Dark, velvety skin patches (acanthosis nigricans) on the neck, armpits or groin, a sign of high insulin
• Difficulty getting pregnant, because ovulation is irregular
• Tiredness, sugar cravings and low mood

Not sure where you stand? Our free PCOS/PMOS symptom checker takes about 60 seconds and shows which pattern your symptoms point towards. It is not a diagnosis, but it can help you prepare for a doctor’s visit.

How is it diagnosed?

Most doctors use the Rotterdam criteria, updated in the 2023 international guideline. You need at least two of these three, after other causes such as thyroid problems, high prolactin and pregnancy have been ruled out:

1. Irregular or absent ovulation
2. Clinical or biochemical signs of high androgens: symptoms such as acne and hirsutism, or raised testosterone on a blood test
3. Polycystic ovaries on ultrasound, or a raised AMH (anti-Müllerian hormone) blood test in adults

A few points that often cause confusion:

• An ultrasound alone cannot diagnose PCOS. Many people without the condition have polycystic-looking ovaries.
• If you have irregular periods and signs of high androgens, you do not need an ultrasound to be diagnosed.
• In teenagers, ultrasound is not recommended for diagnosis, because polycystic-looking ovaries are normal in the first years after periods start.

Your doctor may also suggest tests for thyroid function (TSH), prolactin, fasting blood sugar or HbA1c, insulin and cholesterol. If you have your fasting glucose and insulin results, you can use our HOMA-IR calculator to estimate insulin resistance.

Types of PCOS

You may read about “types” of PCOS, such as insulin-resistant, inflammatory, adrenal or post-pill PCOS. These are not official medical categories, and many people fit more than one. Still, two patterns are useful to know:

• Insulin-resistant (metabolic) PCOS is the most common pattern. Clues include belly weight, energy crashes after meals, sugar cravings and dark skin patches. It can happen at any weight and is especially common in South Asian women.
• Lean PCOS describes people with a normal weight who still have PCOS. Insulin resistance can be present here too, so the same eating and exercise principles help, with the focus on food quality rather than weight loss.

Treatment and management

There is no permanent cure for PCOS, PCOD or PMOS, but it can be managed very well. Treatment depends on your symptoms and goals, for example regular periods, clearer skin or pregnancy.

Lifestyle changes come first

• Eat for steady blood sugar: protein and fibre at every meal, whole grains and millets instead of refined ones, and fewer sugary drinks and snacks. Our PCOS diet chart with Indian foods includes a 7-day vegetarian meal plan.
• Move regularly: aim for 150 minutes of moderate activity a week plus strength training twice a week. A 10 to 15 minute walk after meals also helps.
• Lose a little weight if you are overweight: losing just 5 to 10% of body weight can make periods more regular and improve insulin resistance.
• Prioritise sleep and stress management: poor sleep and chronic stress both worsen insulin resistance. Our guide to the circadian rhythm has tips on sleeping better.

Medicines your doctor may suggest

• Combined oral contraceptive pills to regulate periods and reduce acne and unwanted hair
• Metformin to improve insulin resistance, often alongside lifestyle changes
• Anti-androgen medicines for hirsutism and acne, used with reliable contraception
• Letrozole, the first-choice medicine to help you ovulate if you are trying to conceive

Supplements such as inositol and vitamin D are popular. Some have early evidence, but results are mixed. Always discuss supplements with your doctor before starting them, especially if you are trying to get pregnant.

Long-term health risks

Part of the reason for the new name is that this condition affects health well beyond periods and fertility. Over time, people with PCOS have a higher risk of:

• Type 2 diabetes and gestational diabetes
• High cholesterol and high blood pressure
• Thickening of the womb lining (endometrial hyperplasia) if periods are very infrequent for a long time
• Sleep apnoea
• Anxiety and depression

The good news is that regular check-ups and healthy habits lower these risks a lot. Ask your doctor how often you should have your blood sugar, blood pressure and cholesterol checked.

When to see a doctor

See a gynaecologist or endocrinologist if you notice:

• Periods that come less often than every 35 days, or stop for three months or more when you are not pregnant
• Persistent acne, unwanted facial or body hair, or scalp hair thinning
• Unexplained weight gain or dark skin patches on the neck or underarms
• Difficulty getting pregnant after 12 months of trying (6 months if you are over 35)
• Very heavy or long periods when they do come

Keeping a record of your cycles and symptoms makes this visit much more useful. The Nitya Health app lets you log your periods, symptoms, food and sleep in one place, so you and your doctor can see the full picture.