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
Police in Germany said thieves broke into Berlin's Bode Museum early on Monday morning and stole the 100kg "Big Maple Leaf" coin.
The great-grandmother-of-seven has explained why she won't retire from her fast food job after four decades - despite the 5am shift starts.
Sunshine gives way to cloud and showers