Everton forward Katja Snoeijs revealed her endometriosis diagnosis after being forced off the pitch with severe pain during a 2023 West Ham match. Describing the agony as 'like being stabbed in the stomach', she detailed debilitating cramps and back pain that made even basic movement impossible. This forced substitution became a pivotal moment, leading her to seek medical help and ultimately receive the diagnosis after keyhole surgery.

Endometriosis, affecting one in ten UK women, typically takes eight years and ten months for diagnosis, though Snoeijs' journey was quicker thanks to Everton's club doctor. She emphasized the emotional toll of doubting her symptoms before the diagnosis, highlighting the condition's debilitating impact on daily life and sports performance.