Charles took part in 372 public engagements last year, even after stepping aside for almost three months because of cancer treatment, according to data compiled by The Times of London newspaper. That made him the second-busiest royal behind his sister, Princes Anne, who had 474 engagements.

King Charles III took a trip to the hospital on Thursday because of side effects from his ongoing cancer treatment.

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 waved to well-wishers as he left his London residence one day after a health setback. The British monarch, 76, was photographed being driven away from Clarence House on March 28, the day after he was briefly hospitalized for a negative reaction to his routine cancer treatment.

King Charles III had another health scare. Buckingham Palace announced on Thursday, March 27, that the King was hospitalized after experiencing side effects from his cancer treatment. According to the palace,

King Charles III was hospitalized for side effects relating to his cancer treatment, and is now back home, Buckingham Palace revealed in embargoed news.

King Charles has been seen in public for the first time since he went to hospital after experiencing temporary side effects from his cancer treatment. He cancelled a trip to Birmingham on Friday on medical advice after spending a short period of time in hospital on Thursday,

King Charles' appointments were canceled after his "short period of observation in hospital," Buckingham Palace said.

Charles returns to Clarence House after a short period in hospital, palace says, but postpones Friday engagements in Birmingham.