When most people — including patients and doctors — think of PCOS, the image is often of someone struggling with weight gain. However, not all women with PCOS are overweight. In fact, a significant subset of Indian women present with what's known as Lean PCOS — showing classic symptoms of PCOS without high body mass index (BMI).
This phenotype can be harder to recognise and treat, but it is clinically just as significant. If you’ve been told your symptoms “don’t fit PCOS” because your weight is in the normal range, you’re not alone.
Lean PCOS refers to women with normal or low BMI (below 25) who still exhibit:
Despite a normal weight, these women can still have:
This makes it vital not to dismiss PCOS based on body weight alone.
| Feature | Classic PCOS | Lean PCOS |
|---|---|---|
| BMI | Usually ≥ 25 | Usually < 25 |
| Visible symptoms | More likely (acne, hirsutism, weight gain) | Often milder or subtler |
| Insulin resistance | Present | Present, but harder to detect |
| Diagnosis | Relatively easier | Often delayed |
| Treatment focus | Weight loss & insulin management | Insulin control, ovulatory support, inflammation reduction |