The widow of late dictator Ferdinand Marcos had just returned to the capital after a lengthy road trip from the province of Ilocos Norte, over 300 kilometres north of Manila, when she decided to check in to a hospital, said her media consultant Lito Gorospe.
"She was suffering from severe fatigue so she decided to be confined," he told AFP.
He declined to comment on the condition of the 84-year-old Marcos, who is a legislator representing the province of Ilocos Norte, home to her husband's family.
The beautiful and glamorous Marcos rose to fame as the wife of Ferdinand Marcos, who was elected president in 1965.
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She became widely criticised for her extravagant lifestyle, spending heavily on clothes and jewelry and amassing a massive collection of shoes, even as most Filipinos remained trapped in poverty.
Her husband declared martial law in 1972 and appointed her as a special envoy, as well as handing her several top government positions. Her widespread power further fuelled resentment over corruption and abuse under the Marcos regime.
After her husband died in Hawaii in 1989, Imelda Marcos was allowed to return to the Philippines where she made a political comeback, elected to the legislature repeatedly.