Brazil's ex-president Luiz Inacio Lula da Silva, whose throat cancer is in remission, was admitted to a Sao Paulo hospital for routine tests Saturday, his spokesman said.
Lula, 67, was expected to return to his home in a Sao Paulo suburb later in the day, Jose Chrispiniano, of the Lula Institute, told AFP.
The hospital was expected to issue a medical bulletin.
Lula was last admitted for a throat exam in April, and doctors said then that he was fine.
Last year he announced his return to politics after being told the larynx cancer he had battled for months was in remission following weeks of chemotherapy and radiotherapy.
Lula, Brazil's first leftist president, was in power from January 2003 to December 2010.
He left office with a 80 percent approval rating and was succeeded by his protege and fellow ruling Workers Party member, Dilma Rousseff.