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King Charles smiles and waves after brief hospitalization for cancer treatment side effects

King Charles smiled and waved to members of the public Friday as he left his home in London, the day after a brief hospitalization for the side effects from his cancer treatment.

Charles was seen Friday as he left Clarence House in the back of a black Audi

An older man in a suit is visible through a car window
King Charles is driven by car from Clarence House, his London home, along The Mall towards Buckingham Palace in London on Friday. On Thursday, the Palace said the king was hospitalized for observation, experiencing 'temporary side effects,' related to a scheduled cancer treatment. (Yui Mok/PA/The Associated Press)

King Charles smiled and waved to members of the public Friday as he left his home in London, the day after a brief hospitalization for the side effects from his cancer treatment.

The King's appointments for the day were cancelled following his "short period of observation in hospital" on Thursday, Buckingham Palace said. 

The King's health has been closely watched ever since early last year when he announced that he had been diagnosed with an undisclosed form of cancer.

Charles was seen Friday as he left Clarence House in the back of a black Audi.

Tourist Julian Mati said he was relieved to see the King looked well. 

"We were horrified when we heard the news yesterday," Mati said. "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."

A man holds up a phone to take a picture of buckingham palace
A man takes a picture of Buckingham Palace in London on Friday. (Kirsty Wigglesworth/The Associated Press)

Charles, 76, stepped away from public engagements for about three months but continued fulfilling state duties, such as reviewing government papers and meeting with the prime minister.

Charles's cancer diagnosis has heaped pressure on the British monarchy, which is still evolving after the 70-year reign of the late Queen Elizabeth II.

When he succeeded his mother in September 2022, Charles's task was to demonstrate that the 1,000-year-old institution remains relevant in a modern country whose citizens come from all corners of the globe. But this task takes much time and energy.

Although the duties of a constitutional monarch are largely ceremonial, the royal whirl can be exhausting. Besides the occasional procession in full royal regalia, there are meetings with political leaders, dedication ceremonies and events honouring the accomplishments of British citizens. That added up to 161 days of royal engagements during Charles's first year on the throne.

Charles' illness came as his daughter-in-law, Catherine, the Princess of Wales, was also diagnosed with cancer. Catherine, the wife of Prince William, the heir to the throne, took more than six months off before returning to public duties in late September.

WATCH | PM Mark Carney meets with King Charles: 

Carney arrives at Buckingham Palace to meet with King Charles

14 days ago
Duration 0:56
Prime Minister Mark Carney sits down with King Charles in London during his first foreign trip as Canada’s prime minister.