Italian Premier Paolo Gentiloni is reportedly in good condition after undergoing angioplasty surgery upon his return from a bilateral meeting in Paris.
Mr Gentiloni's office confirmed the 62-year-old leader was taken to Rome's Gemelli hospital, but would not comment on the nature of the illness.
The Italian news agency ANSA said Mr Gentiloni had undergone angioplasty surgery on a peripheral blood vessel on Tuesday evening and was in good condition.
Mr Gentiloni, formerly Italy's foreign minister, took over as premier last month after the previous government resigned.
Mr Gentiloni met with French President Francois Hollande in Paris on Tuesday on the first round of official visits by an Italian head of government after taking office.
He decided to get checked by the Gemelli after feeling unwell following his landing in Rome, ANSA said.
His meeting on Thursday with British Prime Minister Theresa May in London was postponed, Chigi Palace said.
Angioplasty uses a balloon to stretch out blocked vessels or arteries, which in the case of heart problems restores blood supply to the heart when medicines do not work.
The procedure also is used to treat angina, chest pain that can be triggered by stress or physical exertion, or as emergency treatment after a heart attack.