Silvio Berlusconi was admitted to Milan's San Raffaele hospital on Tuesday, sources at the ex-premier's Forza Italia (FI) party said on Wednesday.
Doctors decided the media billionaire should go into hospital for tests after a check-up, the sources said.
He arrived at the San Raffaele via helicopter after spending Easter at his daughter Marina's home in Provence, the sources added.
He also had a short spell in hospital last month.
The 84-year-old was seriously ill with COVID-19 last year and then had another spell in hospital later in 2020 due to a heart problem.
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