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.
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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.