“The surgery was successful. However, tests after the operation found cancer had been present. My medical team, therefore, advised that I should undergo a course of preventative chemotherapy and I am now in the early stages of that treatment.”

In the video statement recorded by the BBC at Windsor, Kate said, “This, of course, came as a huge shock, and William and I have been doing everything we can to process and manage this privately for the sake of our young family.”

She said her family has had to take the time after her surgery to explain her situation to her children “and to reassure them that I am going to be OK.”

In her message, she said she hopes the public understands that her family needs the space, time and privacy to complete her treatment.

“At this time, I am also thinking of all those whose lives have been affected by cancer,” she said in the video. “For everyone facing this disease, in whatever form, please do not lose faith or hope. You are not alone.”

King Charles III, who is fighting colon cancer, praised Princess Kate for her courage.

“So proud Catherine for her courage in speaking as she did,” Charles said.

Prince Harry and Meghan released a statement, saying, “We wish health and healing for Kate and the family, and hope they are able to do so privately and in peace.”

Amanda Pritchard, the chief executive of Britian’s National Health Service also offered her support.

“Speaking out about it is really brave and it can help others to get worrying signs and symptoms checked,” said Pritchard.

Pritchard also urged Britons to get checked for cancer via the NHS.

“If you’re worried about cancer, the NHS website has more information,” Pritchard said.