Polycystic Ovary Syndrome (PCOS) is a hormonal and metabolic disorder in women. It can affect ovulation, blood sugar balance, skin, hair growth, mood, and quality of life. According to a 2024 meta-analysis, the condition affects 9.2% of women of reproductive age globally.
On the other hand, autoimmunity is diagnosed when your immune system mistakenly attacks healthy cells, tissues, or organs. More than 100 such lifelong disorders have been identified, which are typically twice as common in women as in men.
While both are distinct conditions, some PCOS symptoms, like low-grade inflammation and insulin resistance, can resemble those of autoimmune conditions. This is why the two conditions are often discussed together.
Read below to find out is PCOS an autoimmune disease, what is the connection between the two and when you should ask your doctor about further testing.
Is PCOS considered an autoimmune disease?
No, PCOS is not an autoimmune disease; it is actually an endocrine and metabolic disorder. It develops when hormone signals, ovarian function, insulin response, and androgen (male hormone) levels fall out of balance.
Its symptoms include irregular menstrual periods, Acne, unwanted facial hair and weight gain. Additionally, it can present with chronic low-grade inflammation. This means your body remains in a mild, ongoing inflammatory state rather than switching off after a normal immune response. It can overlap with how autoimmune conditions feel, especially when symptoms like fatigue, body aches, or brain fog appear.
PCOS and autoimmune disease connection
Polycystic Ovary Syndrome and autoimmune diseases both can involve genetic factors, hormone changes and immune signaling. Thus, they are often discussed and studied together. So, while PCOS is not an autoimmune disease, some pathways can appear similar. This is what the studies say about these two conditions:
Similar antibodies and immune markers
Researchers have studied immune markers and autoantibodies (misguided antibodies that harm the body’s own cells). Women with PCOS were found to have:
- Anti-Thyroid Peroxidase (Anti-TPO) antibodies, which are linked to thyroid autoimmunity.
- Antinuclear Antibody (ANA), which is a blood marker for autoimmune conditions such as Lupus, Sjögren’s and Rheumatoid Arthritis.
This suggests that further testing is needed in women with PCOS if one or both of these markers come up positive.
Insulin resistance overlap
Due to hormonal imbalance, PCOS often involves insulin resistance. In this condition, the body requires more insulin to manage blood sugar. It can lead to sugar cravings, weight gain or Diabetes.
Likewise, Type B Insulin Resistance Syndrome (TBIRS) and Hirata’s Disease are autoimmune conditions that involve inflammation that affects metabolism. In TBIRS, antibodies attack insulin receptors, while in Hirata’s antibodies attach to insulin itself, causing Hyperglycemia. They can also cause facial hair growth or irregular periods, similar to PCOS, which is why these are often confused.
Risk of autoimmune diseases if you have PCOS
A hormonal-metabolic imbalance like PMOS, coupled with a genetic predisposition (autoimmunity cases in the family), is more likely to lead to one. Some autoimmune diseases linked to PCOS are listed below.
1. Hashimoto’s Thyroiditis
If you are experiencing persistent fatigue, hair thinning, cold sensitivity, or worsening menstrual irregularity, it could be due to an Autoimmune Thyroid Disease, especially Hashimoto’s Thyroiditis. In this condition, the immune system produces antibodies that can affect thyroid function over time. Thus, you should discuss regular thyroid function tests with your doctor if you have PMOS.
2. Lupus
If you notice joint swelling, unexplained rashes, mouth ulcers, or repeated fevers alongside PCOS symptoms, it could be Systemic Lupus Erythematosus (SLE). Lupus is an autoimmune disease wherein the immune system affects the skin, joints, kidneys, blood, and other organs. Therefore, you should speak with your doctor about further evaluation if these symptoms recur.
3. Type 1 Diabetes
If you experience frequent urination, excessive thirst, unexplained weight loss or unusual fatigue, you should get tested for Type 1 Diabetes. It is an autoimmune disorder in which the immune system damages insulin-producing cells in the pancreas.
A large Danish study published in The Endocrinologist in 2025 found that the diagnosis of Type 1 Diabetes was 3.5 times higher in women with PCOS compared with others. It is thus recommended to get tested for blood sugar control issues promptly.
Other autoimmune diseases being studied in relation to Polycystic Ovary Syndrome include Psoriasis, Systemic Sclerosis, Addison’s Disease, Rheumatoid Arthritis, and Undifferentiated Connective Tissue Disease.
When to see a doctor for a detailed screening?
If your symptoms are new, worsening, or no longer match your usual PCOS pattern, it is important to discuss the same with your doctor. You should seek medical advice if:
- Your periods suddenly become irregular, very heavy, or stop for several months.
- Acne, facial hair growth, or hair loss worsens quickly.
- You notice rapid weight gain or unexplained weight loss.
- You have persistent fatigue, temperature sensitivity and constipation.
- You have a family history of autoimmune disease.
Your healthcare provider will guide you through the next steps, such as thyroid function tests, autoimmune testing or a comprehensive hormone panel.
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Conclusion
Polycystic Ovary Syndrome, or PCOS, is not an autoimmune disease. It is a hormonal and metabolic endocrine disorder which has now been renamed as Polyendocrine Metabolic Ovarian Syndrome (PMOS). Because it can co-occur with chronic inflammation, insulin resistance, autoimmune markers and shared genetic risk factors, it is often confused with autoimmunity.
Research suggests that some autoimmune conditions, especially Hashimoto’s Thyroiditis, Lupus and Type 1 Diabetes, are more common in women with PCOS. The greater vulnerability is due to hormonal changes that can affect the immune system response. This means it can make some women more vulnerable to autoimmunity, but it does not mean every woman will develop one.
However, if your symptoms feel different from your usual PCOS pattern, consult your doctor. Ask them whether thyroid testing or antibody screening is required based on your symptoms and family history. Seek further medical guidance from a specialist, depending on the results and diagnosis.
Frequently Asked Questions
Is PCOS an inflammatory disease?
No, PCOS is not classified as an inflammatory disease. It is an endocrine and metabolic disorder. Even though chronic low-grade inflammation is common in many women with Polycystic Ovary Syndrome, this alone does not confirm autoimmunity either.
Should I get autoimmune tests if I have PCOS?
No, you do not need to get autoimmune tests just because you have PCOS. You should discuss it if you have a family history of autoimmune disease. Moreover, if you experience persistent fatigue, hair loss or weight changes, discuss thyroid function tests or thyroid antibody testing with your doctor.
Can I have PCOS and an autoimmune disease at the same time?
Yes, you can have PCOS and an autoimmune disease at the same time. Conditions like Hashimoto’s Thyroiditis, Type 1 Diabetes, Rheumatoid Arthritis and Lupus can occur alongside it.
Is Endometriosis an autoimmune disease?
No, Endometriosis is not classified as an autoimmune disease. However, it is linked with systemic inflammation and immune dysfunction, which is why researchers continue to study the connection.
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