President Jacob Zuma said Nelson Mandela is "responding very well to the treatment" as he urged the country not to panic.
He told BBC News: "Of course I have been saying to people, you should bear in mind Madiba is no longer that young and if he goes for check-ups every now and again, I don't think people must be alarmed about it. I would like to really say the country must not panic."
More top news
Employment Minister Priti Patel has launched a scathing attack on the government's 'chaotic' immigration controls.
Hanako died peacefully in a Tokyo zoo after living alone for 67 years.
A hearing found Kirsten Treasure guilty of 'shocking' catalogue of misconduct, including refusing to respond to a manslaughter crime scene.