A Vatican spokesperson said on Friday that Pope Francis had a fever and missed his Friday meetings after a hectic day.

Cardinal Pietro Parolin, who is seen as the Vatican No. 2, told reporters that Francis was tired and blamed his fever on the exhaustion he got from greeting everyone on Thursday from his school foundation.

“He wanted to greet all of them and probably at some point lost his strength,” Parolin said to the LaPresse news agency.

It is unclear if the pontiff will have private audiences on Saturday.

A Vatican official, who spoke on condition of anonymity, confirmed to the AP news agency that the pope did not receive anyone in the audience on Friday “because of a feverish state.”

The 86-year-old Argentine has faced a lot of health issues in recent years.

In March, Francis was taken to the hospital where he was diagnosed with acute bronchitis. He got intravenous antibiotics and was discharged three days later.

The 89-year-old had a busy schedule this week, as he led both public and closed-door meetings of the Italian bishops conference for their 77th general assembly. After that, he took part in an afternoon meeting with his school foundation Scholas Occurentes on Thursday, and met with several other prelates and visiting dignitaries.

He is expected to preside over Pentecost Mass on Sunday in St. Peter’s Basilica, and in a sign that he was likely to recover soon, the Vatican on Friday announced a new official audience with Italian President Sergio Mattarella, planned for Monday.

Also on May 25, Pope Francis gave an exclusive interview in Spanish to Telemundo News.

Pope’s health problems The health of the pope has always been a concern ever since he was elected pontiff in March 2013. He was 76 then,

Before his rise, it was widely known that he had part of one of his lungs removed in his native Argentina when he was in his 20s.

On one occasion, the pope predicted early on in his papacy that his life would be short-lived.

“This will last a short time, two or three years, and then we go to the house of the father,” he told reporters in 2014, before making a cutting gesture and a whistling sound.

Last July while coming back from a trip to Canada, Francis admitted that his advancing age and his difficulty walking might have started a new, slower phase of his papacy.