Kate Middleton 's cancer diagnosis came as a "huge shock" to the royal, as well as the rest of the world. The Princess of Wales revealed she is undergoing preventative chemotherapy in a personal video message shared on March 22. The news came after weeks of speculation regarding Kate's health following her "planned abdominal surgery" in January.

Kate announced in March that she had been diagnosed with cancer after undergoing what the palace described as "planned abdominal surgery" in January. She has not revealed publicly what type of cancer she faced, nor exact details of her treatment beyond that she was undergoing "preventative chemotherapy."

Kate said that she was now undergoing “a course of preventative chemotherapy” on the advice of her medical team. She did not specify what type of cancer she has or at what stage it was found, and Kensington Palace, the couple’s royal household, has not said why the operation was necessary.