Katherine explains how women have long been underrepresented in research and clinical trials, leading to misdiagnosis, overlooked conditions, and unsafe treatments. She shares innovative partnerships, such as Boots and Tesco using loyalty card data to detect ovarian cancer earlier, and stresses the importance of recording women’s symptoms. With insights on ethics, wearables, and projects like Our Future Health and Women in Data’s Women’s Health chapter, Katherine shows how data can drive meaningful progress in women’s health.