Britain's King Charles is returning to public duties this week after he was briefly taken to hospital last Thursday when he experienced side effects from his cancer treatment, a royal source said on Monday.

King Charles III was briefly hospitalized Thursday amid ongoing medical treatment for cancer, according to Buckingham Palace. Charles' hospitalization was a result of "temporary side effects" he experienced after undergoing what the palace described as "scheduled and ongoing medical treatment for cancer" on Thursday morning.

King Charles III has waved to well-wishers in central London as he headed for his country estate in western England.