The short answer: Yes, PCOS (PCOD) raises the chance of womb (endometrial) cancer, but the actual risk for any one woman stays low, and most women with PCOS never develop cancer. The extra risk comes mainly from years of very infrequent periods, when the womb lining builds up without being shed; extra weight and diabetes add to it. Making sure the lining is shed regularly, and getting any unusual bleeding checked, lowers the risk. For ovarian cancer the evidence is mixed, and breast cancer risk does not appear to be raised. In Hindi people often ask PCOS se cancer hota hai kya (क्या पीसीओएस से कैंसर होता है).
On this page
- PCOS: More Than Just Irregular Periods
- Why PCOS Increases Endometrial Cancer Risk
- Additional Risk Factors That Compound PCOS Risk
- What Every Woman with PCOS Should Do
PCOS: More Than Just Irregular Periods
Polycystic ovary syndrome (PCOS) is the most common endocrine disorder in women of reproductive age, affecting an estimated 8–13% of women globally and up to 20% in some South Asian populations including India. It is characterised by a combination of irregular or absent ovulation, elevated androgen levels (causing acne, excess hair growth, or hair thinning), and polycystic-appearing ovaries on ultrasound. You need only two of these three criteria to be diagnosed with PCOS. For symptoms, tests and treatment, see our page on understanding PCOS.
What is less widely appreciated is that PCOS carries significant long-term health implications beyond fertility — including an elevated risk of endometrial cancer that all women with PCOS should understand.
Why PCOS Increases Endometrial Cancer Risk
The mechanism is oestrogen without progesterone. In a normal menstrual cycle, ovulation triggers progesterone production in the second half of the month. Progesterone opposes oestrogen and causes the uterine lining to shed. In PCOS, ovulation is irregular or absent — meaning the uterine lining is continuously exposed to oestrogen without the balancing effect of progesterone. Over months and years, this unstimulated growth can progress: normal endometrium → endometrial hyperplasia (an overgrown lining) → atypical hyperplasia (overgrowth with abnormal cells) → endometrial carcinoma. Only a small proportion of women go through all these steps, and an overgrown lining can usually be treated before it turns into cancer.
What the research shows: a 2014 review that pooled earlier studies (Barry and colleagues, Human Reproduction Update) found that women with PCOS were about 2.8 times as likely to have endometrial cancer as women without PCOS, and the difference was larger in women under 54. The authors cautioned that the studies were small and observational, and that extra weight, which is common in PCOS, may explain part of the link, so the true increase may be smaller. A relative increase like this sounds large, but because womb cancer is uncommon in younger women, the actual risk for any one woman with PCOS remains low. It does mean that long gaps between periods and unusual bleeding should not be ignored. For a practical plan, see our guide to long-term PCOS and endometrial health.
Additional Risk Factors That Compound PCOS Risk
- Obesity — adipose tissue is an additional source of oestrogen production; PCOS and obesity frequently co-exist
- Insulin resistance and Type 2 diabetes — common in PCOS; insulin stimulates endometrial proliferation
- Nulliparity — women who have never been pregnant have fewer progesterone-dominant cycles
What Every Woman with PCOS Should Do
- Do not allow more than 3–4 months without a period without medical review — this represents unopposed oestrogen exposure
- Report any irregular bleeding promptly, particularly around menopause, and any bleeding after menopause, even once (see bleeding after menopause)
- Use hormonal contraception (combined pill or progesterone-only) or cyclical progesterone if not trying to conceive — this protects the endometrium
- Pursue lifestyle modifications (weight management, regular exercise) to reduce insulin resistance
- Ask for an endometrial assessment (an ultrasound scan and, if needed, a small sample of the lining) if you are perimenopausal with a longstanding PCOS history and heavy or irregular bleeding
Do women with PCOS need regular cancer tests?
No routine biopsy or cancer screening test is needed if you have no symptoms. An ultrasound scan, and sometimes a small sample of the lining (endometrial biopsy), is advised if periods stay absent for long stretches without treatment, if bleeding becomes very heavy, prolonged or irregular, or if there is any bleeding after menopause.
Dr. Nishtha Tripathi Patel offers specialist consultations for women with PCOS and gynaecological cancer concerns in Ahmedabad. Contact: +91 76988 00333.