Winnie Madikizela-Mandela, who was once married to former South African President Nelson Mandela, is in hospital for what her family said on Friday was "an existing diabetes condition."
The family did not provide any further details. Madikizela-Mandela, 75, was a driving force in ending apartheid in SouthAfrica.
Madikizela-Mandela was in hospital in September for an ankle ailment.
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