Buckingham Palace says King Charles III was hospitalised for observation today after experiencing "temporary side effects" related to a scheduled cancer treatment.
His engagements for Friday and Saturday were cancelled.
"His Majesty has now returned to Clarence House and as a precautionary measure, acting on medical advice, tomorrow's diary programme will also be rescheduled," the palace said.
"His Majesty would like to send his apologies to all those who may be inconvenienced or disappointed as a result."
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Charles, 76, has been undergoing treatment for an undisclosed form of cancer for more than a year.
The monarch visited a cancer treatment charity in London, with signs his openness is encouraging people to get check-ups. (Source: 1News)
Late last year palace sources said the treatment cycle would continue into 2025 with the king set to return to a "full programme" of duties.
Since then, the king has continued fulfilling his state duties, such as reviewing government papers and meeting with the prime minister, even though he took some time off public duties.
Catherine, Princess of Wales announced last year that she also had cancer after it was detected when she went for planned abdominal surgery. After a course of chemotherapy, she was declared "cancer-free".
- Additional reporting by 1News
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