Buckingham Palace says King Charles has been diagnosed with a form of cancer.
However, the type of cancer has not been revealed, it is not prostate cancer, but was discovered during his recent treatment for an enlarged prostate.
The Palace said the King began regular treatments yesterday and will postpone public duties during the treatment.
Meanwhile, The Duke of Sussex, Prince Harry, who lives in the United States, spoke to his father, King Charles and will be travelling to the United Kingdom to see him in the coming days.