The short answer: Extra body weight is the biggest risk factor for womb (endometrial) cancer that a woman can change. Body fat makes the hormone oestrogen, especially after menopause, and years of extra oestrogen can make the womb lining overgrow. The more extra weight, the higher the risk, and PCOS and diabetes add to it. This does not mean that every woman who is overweight will get cancer; most will not. Losing weight helps, and the most important step is to get any bleeding after menopause, or unusual bleeding before it, checked early. In Hindi people often search bachedani ka cancer kaise hota hai (बच्चेदानी का कैंसर कैसे होता है).
Endometrial cancer is the most common gynaecological cancer in many Indian cities and is becoming more common. The single strongest modifiable risk factor is obesity — and India’s obesity prevalence has roughly doubled in two decades. This article explains the biology, the numbers, and what can be done.
On this page
- Why obesity drives endometrial cancer
- How much risk is added
- PCOS, diabetes — multipliers
- Symptoms in higher-risk women
- Prevention and screening
Why obesity drives endometrial cancer
Adipose tissue (body fat) is hormonally active. It converts androgens to estrogens via aromatase enzyme. In post-menopausal women, this peripheral estrogen production is the dominant source — and unopposed estrogen (without progesterone balance) stimulates endometrial growth. Over years, this can lead to endometrial hyperplasia and then cancer.
How much risk does obesity add?
- BMI 25–30 (overweight): risk roughly doubled vs normal weight
- BMI 30–35 (obese): risk approximately 3-fold
- BMI 35-40 (severely obese): risk approximately 5–6 fold
- BMI > 40 (morbidly obese): risk 8–10 fold
For Indian women, ethnicity-specific BMI cut-offs apply (overweight at BMI 23, obese at 25) because of higher body-fat composition at same BMI.
These figures come from studies that compared large groups of women, mostly outside India. They show how risk rises with weight across a population; they cannot predict what will happen to any one woman.
PCOS, diabetes — multipliers
Polycystic Ovary Syndrome (PCOS) causes anovulation, prolonged unopposed estrogen exposure, and is associated with insulin resistance — all of which compound endometrial cancer risk. Long-standing PCOS in obese women carries among the highest endometrial cancer risks in the gynaecological literature.
Diabetes (Type 2) is an independent risk factor through insulin-IGF-1 signalling pathways that promote endometrial cell proliferation. The combination of obesity + diabetes + PCOS is particularly concerning.
Symptoms higher-risk women should not ignore
- Any bleeding after menopause, even once. About 9 in 10 women with endometrial cancer have this kind of bleeding, but most women who bleed after menopause do not have cancer; it is found in about 5–10%.
- Irregular or heavy periods becoming heavier in your 40s
- Bleeding between periods
- Watery or blood-tinged vaginal discharge
See our dedicated post: postmenopausal bleeding evaluation.
Prevention and surveillance
The single most effective preventive intervention is weight management. Even 5–10% body weight reduction lowers endometrial cancer risk measurably. For women with PCOS, hormonal management (progestin-containing contraception or LNG-IUD) protects the endometrium from unopposed estrogen.
Population-wide endometrial cancer screening is not currently recommended. However, women with risk factors (obesity + PCOS + diabetes + family history) should report any abnormal bleeding promptly. Surveillance protocols are individualised.
For full disease overview see endometrial cancer page and stage-specific treatment: Stage 1, fertility-sparing options.
FAQs
Does losing weight reverse the risk?
Risk decreases progressively with sustained weight loss. The longer you remain at a healthier weight, the lower the lifetime risk.
I have PCOS but normal weight. Am I still at risk?
Modest elevation in risk from PCOS itself, primarily driven by anovulation. Hormonal management can mitigate it. Discuss with your gynaecologist.
Should I have endometrial biopsy as screening if I'm obese?
Not routinely. Reserved for women with abnormal bleeding, thickened endometrium on ultrasound, or specific high-risk genetic syndromes.
Is bariatric surgery preventive?
Observational studies (which follow groups of women rather than testing the operation in a trial) suggest that bariatric (weight-loss) surgery lowers the chance of endometrial cancer in women with severe obesity, probably through weight loss and hormonal changes. It is not done for cancer prevention alone; the decision depends on your overall health.
What about HRT?
Estrogen-only HRT increases endometrial cancer risk in women with intact uteruses. Adding a progestogen protects the womb lining, which is why women who still have a womb are given combined HRT; the type and schedule should be planned with your doctor.
If I am overweight and am diagnosed with womb cancer, can I still have keyhole or robotic surgery?
Often, yes. Keyhole (laparoscopic) or robotic surgery suits many women with early womb cancer, including many women who are overweight, and usually means smaller cuts and a quicker recovery. It is not right for everyone; the choice depends on your scans, your heart and lung health and any previous surgery. Our page on uterine cancer surgery options compares the approaches, and our overview of uterine cancer care explains the whole treatment pathway.
Reviewed by Dr. Nishtha Tripathi Patel, MBBS, DGO, DNB, Fellowship Gynaecological Oncology, ESGO-certified. To book: WhatsApp +91 76988 00333.