Winnie Madikizela-Mandela was admitted to the Millpark hospital on Wednesday, a spokesperson confirmed.
Madikizela-Mandela has been admitted for observation, her spokesperson Victor Dlamini told News24 on Thursday.
He was unable to provide any additional information.
Madikizela-Mandela stayed briefly in the Millpark Hospital in December for observation.
In April, she was in a hospital after undergoing back surgery.
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