Pope Francis was admitted to hospital for bronchitis treatment Friday and has canceled all scheduled events for the next three days, according to the Vatican.

Pope Francis was being treated in a hospital in Rome for bronchitis and to have medical examinations, the Vatican said Friday, the latest in a string of ailments that have raised concerns about the 88-year-old pontiff’s health.

The 88-year-old pontiff, who has been battling health problems for years, has begun treatment in a Rome hospital.