Polycystic ovary syndrome (PCOS) is often thought of as a testosterone-related condition, but did you know that oestrogen plays a significant role too? In women with PCOS, the extended follicular phase leads to prolonged exposure to oestrogen, contributing to common symptoms like heavy periods, breast tenderness, and mood swings. In this blog post, we explore how hormonal imbalances—including low progesterone, aromatisation of testosterone to oestrogen, and increased sensitivity to oestrogen—affect those with PCOS. Plus, we look at how endocrine disruptors like BPA can worsen these symptoms.