Pope Francis has gone to Rome’s Gemelli hospital for a check-up.
Earlier this year the pope, 86, spent five days in hospital with a lung infection and last month had to skip audiences due to a fever.
The Vatican has so far not commented on the exact reason for his visit today.
Over the weekend he delivered a noon prayer in St Peter’s square in the Vatican.
Pope Francis, who marked his tenth year as pontiff in March, has suffered a number of ailments in recent years.
In July 2021 he had part of his colon removed in an operation aimed at addressing a painful bowel condition called diverticulitis.
The Vatican announced plans on Saturday for Francis to visit Mongolia in late August and early September.
On his visit to the country he is due to visit a tiny Christian community as part of his aim to visit Catholics on the periphery of the church’s reach.
Statistics provided by the non-profit Aid to the Church in Need show that Mongolia is just 2% Christian.
Before that he is due to visit Portugal in early August where he will attend the World Youth Day in Lisbon and visit the Shrine of Fatima.