The monarch, 76, waved at well-wishers while leaving Clarence House in London in a car this morning. It is understood he was going to his Highgrove estate in Gloucestershire.
It comes after he cancelled his Friday engagements due to “temporary side effects” from his cancer treatment.
Buckingham Palace said after “scheduled and ongoing medical treatment for cancer” on Thursday, the King “experienced temporary side effects that required a short period of observation in hospital”.
The King revealed in February 2024 that he had been diagnosed with cancer and was beginning treatment.
He returned to public duties in April last year and sources suggested in December his treatment would continue in 2025 and was “moving in a positive direction”.
It was described as a “most minor bump in a road that is very much heading in the right direction”, the Press Association said, quoting a source.
The King visited the London Clinic on Thursday morning and travelled to and from the hospital by car. He was not joined by the Queen during his brief stay.
Tourist Julian Mati, 34, said it was a “relief” to see the King looking well, admitting he was “horrified when we heard the news yesterday.
“We had come down to the palace today to take pictures, but we never imagined we would see the King. To see him smiling and waving, it’s such a relief.”
In its statement, the palace added that the King “would like to send his apologies to all those who may be inconvenienced or disappointed as a result [of his cancelled appointments].”
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On Wednesday, the King had a typically busy day of activities. He was at London’s Somerset House, where he unveiled a plaque, before hosting a reception at Buckingham Palace in the evening.
Last week, the royals also made a three-day visit to Northern Ireland.
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