London — Britain's King Charles had a setback in his cancer treatment ... "the king experienced temporary side effects that required a short period of observation in hospital." ...

By Mark Landler Reporting from London King Charles III was briefly hospitalized on Thursday after suffering side effects from his cancer treatment, Buckingham Palace said in a statement.

"The King experienced temporary side effects that required a short period of observation in [the] hospital," the statement continued. King Charles' events scheduled for Thursday afternoon were ...

Britain’s King Charles “required a short period of observation in hospital” on Thursday after experiencing “temporary side effects” from a scheduled cancer treatment in the morning ...

His Friday events were canceled. King Charles was briefly hospitalized Thursday after experiencing “temporary” side effects from his cancer treatment, according to reports. POOL/AFP via Getty ...