Kate announced in March 2024 she was undergoing treatment after an abdominal surgery, completed chemotherapy in September 2024 and said she was in remission in January 2025; the cancer type was not disclosed. William has said the couple "chose to communicate a lot more with our children," noting it can feel like "oversharing" but that hiding things often doesn't work, comments he made during an interview in Brazil for the 2025 Earthshot Prize Awards.
Extracts from Russel Myers's book describe how the couple calmly told their children what was happening, kept in touch via video calls while Kate was in hospital, and that despite a "pretty grueling time," her focus remained on the children.