Pope Francis, who was admitted to a hospital in Rome for bronchitis, is in “fair” condition with a “respiratory tract infection,” the Vatican said Friday in what is 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.

Pope Francis was hospitalized Friday for the fourth time since he was elected in 2013. Francis, who was diagnosed with bronchitis last week, had part of one lung removed as a young man and has recurring bouts of bronchitis,