King Charles needs to have a “short” observation at the hospital Thursday after scheduled cancer treatment

King Charles was hospitalized Thursday for scheduled cancer treatment after experiencing “temporary side effects.” Buckingham Palace said in a statement.

His participation on Thursday afternoon and Friday was cancelled.

“Je's downtown has now returned to the Clarence House as a precautionary measure, and tomorrow's diary plan will be rescheduled as well,” the palace said.

“Under je, I want to apologize to all those who may be inconvenient or disappointed.''

Charles, 76, has been under treatment for the undisclosed form of cancer for more than a year. The king continued to perform his state duties, even though he spent some time on public duties.

His disease was his daughter Katherine, Princess of Wales, who was also diagnosed with cancer. She took six months off before returning to public duties in late September.