King Charles of the United Kingdom has been diagnosed with a form of cancer, says Buckingham Palace.
The type of cancer has not been revealed - it is not prostate cancer, but was discovered during his recent treatment for an enlarged prostate, reports BBC.
The King began "regular treatments" on Monday and will postpone public duties during it, the Palace said.
The Monarch, 75, "remains wholly positive about his treatment and looks forward to returning to full public duty as soon as possible," it added.
No further details are being shared on the stage of cancer or a prognosis.
King Charles informed both his sons personally about his diagnosis and the Prince of Wales was said to be in regular contact with his father.
The Duke of Sussex, Prince Harry, who lives in the United States, spoke to his father and will be travelling to the UK to see him in the coming days.
The King returned to London from Sandringham in Norfolk on Monday morning and the palace says he has started treatment as an outpatient.
Although he will pause his public events, the King will continue with his constitutional role as head of state, including paperwork and private meetings.
It is understood his weekly audiences with Prime Minister Rishi Sunak will continue and will be in person, unless doctors advise that he limits such contact.
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