Polycystic Ovary Syndrome (PCOS) is the most common hormonal disorder in women of reproductive age, affecting an estimated 10 to 15% of Indian women. Most women with PCOS are concerned about infertility, irregular periods, and weight management — but there is another risk that is less talked about: the link between PCOS and gynecologic cancer, particularly uterine (endometrial) cancer.
What Is PCOS?
PCOS is a hormonal condition characterised by:
- Irregular or absent periods
- Elevated androgen (male hormone) levels — causing acne, excess hair growth, and hair thinning
- Multiple small cysts on the ovaries (seen on ultrasound)
- Insulin resistance — which often leads to weight gain and difficulty losing weight
Does PCOS Cause Cancer?
PCOS does not directly cause cancer. However, it creates hormonal conditions that can increase the risk of certain cancers — most significantly, uterine (endometrial) cancer.
Why Does PCOS Increase Uterine Cancer Risk?
Here is the key mechanism:
In a normal menstrual cycle, ovulation triggers the production of progesterone, which causes the uterine lining (endometrium) to shed each month. In women with PCOS, ovulation is often absent or infrequent. This means the uterine lining is not shed regularly and is instead exposed to oestrogen continuously — without the balancing effect of progesterone.
This ongoing exposure to unopposed oestrogen causes the uterine lining to thicken (a condition called endometrial hyperplasia). Over time, without treatment, some cases of endometrial hyperplasia can progress to endometrial cancer.
How Much Does PCOS Increase the Risk?
Research suggests that women with PCOS have approximately 3 times the risk of developing uterine cancer compared to women without PCOS. This is a significant but manageable risk — provided women understand it and take steps to protect themselves.
Other Cancer Risks Associated with PCOS
The evidence is less definitive, but some studies also suggest a slightly increased risk of:
- Ovarian cancer — though the link is weaker and still debated
- Breast cancer — possibly related to insulin resistance and obesity
What Should Women with PCOS Do?
1. Do Not Ignore Irregular Bleeding
If you have PCOS and experience prolonged gaps between periods (more than 3 months without a period), or if your periods become very heavy or unpredictable, see a doctor. An ultrasound to measure endometrial thickness may be recommended.
2. Induce Regular Periods
Your gynaecologist may prescribe oral contraceptives, progestins, or other medications to ensure you have regular periods — this protects the uterine lining.
3. Manage Weight and Insulin Resistance
Obesity worsens PCOS and significantly increases uterine cancer risk. Even a modest weight loss of 5 to 10% of body weight can improve hormonal balance and reduce cancer risk.
4. Have Regular Check-ups
Women with PCOS — especially those who are overweight, have had prolonged periods of amenorrhoea (absent periods), or are approaching perimenopause — should have regular pelvic assessments and discuss endometrial surveillance with their gynaecologist.
5. Know the Warning Signs
The most important warning sign of uterine cancer is abnormal uterine bleeding — especially bleeding after menopause. Do not dismiss this.
The Bottom Line
Having PCOS does not mean you will get cancer. But it does mean you need to be proactive about your health. Understand the risk, manage your hormonal health, and stay alert to warning signs. With the right care, the risk is very manageable.
Dr. Monisha Gupta is a Gynecologic Oncologist at Fortis Hospital, Shalimar Bagh, New Delhi. If you have PCOS and concerns about your cancer risk, she is available for specialist consultations.
