Buckingham Palace has been notoriously tight-lipped when it comes to the health of the British royal family. But three royals have been diagnosed with cancer this year alone. 

The most recent member to announce a cancer diagnosis was Kate Middleton, the Princess of Wales, who revealed her cancer battle on Friday. King Charles III, and Sarah Ferguson, who was married to Prince Andrew, have also revealed their own battles with the disease.

Here is a look at what we know about each of these diagnoses: 

The kind of cancer that the princess was diagnosed with has not been disclosed so far, but it was found following a major abdominal surgery in January. The stage of the cancer has also not been revealed, but Kate claimed that she is already undergoing preventive chemotherapy.

“As you can imagine, this has taken time,” Kate said in a video posted to X. “It has taken me time to recover from major surgery in order to start my treatment. But most importantly, it has taken us time to explain everything to George, Charlotte, and Louis in a way that’s appropriate for them and to reassure them that I’m going to be OK. As I’ve said to them, I am well. I’m getting stronger every day by focusing on the things that will help me heal in my mind, body, and spirit.”

A spokesperson for Kensington Palace, where Kate and Prince William reside with their children, said the princess is focused on making a “full recovery,” and will return to royal duties when she’s cleared by her medical team.

Britain’s monarch made his unexpected cancer announcement in February, after he was hospitalized with an enlarged prostate. The palace has also not revealed the type of cancer that the king has, but he is undergoing treatment for the disease.

“His Majesty has today commenced a schedule of regular treatments, during which time he has been advised by doctors to postpone public-facing duties. Throughout this period, His Majesty will continue to undertake State business and official paperwork as usual,” the palace said in a statement. “The King is grateful to his medical team for their swift intervention, which was made possible thanks to his recent hospital procedure. He remains wholly positive about his treatment and looks forward to returning to full public duty as soon as possible.”

Charles has been the country’s monarch since Sept. 8, 2022, after the death of his mother, the late Queen Elizabeth II. The late queen also had cancer, a form of white blood cell cancer called Myeloma.

Sarah Ferguson, Duchess of York, was the first to announce her battle with cancer in January, and has been diagnosed with skin cancer. It comes on the heels of her fight with breast cancer, which was cleared in December.

The melanoma was discovered when a dermatologist removed moles and found one to be cancerous. She was undergoing reconstructive surgery following her mastectomy at the time.

“She is undergoing further investigations to ensure that this has been caught in the early stages,” a spokesperson for the duchess told CBS News. “Clearly, another diagnosis so soon after treatment for breast cancer has been distressing but the Duchess remains in good spirits.”

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Ferguson married into the royal family in 1986, after marrying Queen Elizabeth II’s second son, Prince Andrew. The couple divorced 10 years later, but she still holds her title as duchess. They have two daughters, the Princesses Beatrice and Eugenie.

Other historic members of the royal family have battled cancer in the past. King Edward VII, who reigned from 1901-1910, had a form of skin cancer, Queen Elizabeth, the queen mother, had breast and colon cancer, and King George VI, Queen Elizabeth II’s father, died of lung cancer in 1952.