Archbishop Emeritus Desmond Tutu has been readmitted to a hospital in Cape Town, his family confirmed today.
But his daughter, Reverend Canon Mpho Tutu, said in a statement his admission into hospital was not related to his cancer treatment
"His oncologist confirms that his PSA level is pleasingly low," the statement released by the Desmond & Leah Tutu Legacy Foundation said.
Tutu was discharged from hospital last Tuesday but re-admitted this afternoon after expressing renewed discomfort.
Archbishop Desmond Tutu is in hospital in Cape Town receiving treatment for a "persistent infection".
In a statement released by the Desmond & Leah Tutu Legacy Foundation, his daughter, the Reverend Canon Mpho Tutu, said she hoped he would be home again "in a day or two".
On the UN Climate Summit, Desmond Tutu has said that we all have a "duty to persuade our leaders to lead us in a new direction"
The Archbishop emeritus of Cape Town and a Nobel peace laureate was writing in the Observer.
David Cameron, anti-apartheid leader Desmond Tutu and Prince Harry have a led a memorial service for former South African president Nelson Mandela.
Harry, who was representing the Queen, was joined by senior politicians including the Prime Minister and Labour leader Ed Miliband at a Westminster Abbey service celebrating the life of Mandela, who died on December 5 aged 95-years-old.
Nearly 2,000 people attended the service which featured South African singing and drumming and an address to the congregation by the country's deputy president Kgalema Motlanthe.
The Most Rev Tutu, the former Archbishop of Cape Town, also made a speech and thanked the "splendid" and "amazing" anti-apartheid campaigners for their efforts in changing the "moral climate" over apartheid.
He said: "What would have happened had Mandela died in prison as was the intention and hope of the upholders of apartheid. I suppose most would have regarded him as no better than a terrorist - after all, persons in high positions in Britain and the US did dismiss him as such."
Archbishop Desmond Tutu is giving a blessing to bring the memorial service to a close.
He begins: "I stand here as an old man and I want to remind you that we got to this point because we were disciplined. So I am not going to give you a blessing until all of you stand."
"I want to hear a pin drop," he exhorts, before looking all around him to check that everyone is standing.
"You must show the world that we are disciplined," he says.
Twitter has reportedly apologised after suspending official the account of the Desmond and Leah Tutu Legacy Foundation during a 'spam clear-up.'
The account was only started overnight and within hours had been suspended.
The Foundation has said that Twitter had apologised for the mistake and the account is now working again:
Archbishop Desmond Tutu has been awarded a £1.1 million prize for "affirming life's spiritual dimension".
The 81-year-old landed the 2013 Templeton Prize for his lifelong work in advancing spiritual principles such as love and forgiveness which have helped to liberate people around the world, organisers said.
The former Anglican archbishop of Cape Town said: "When you are in a crowd and you stand out from the crowd it's usually because you are being carried on the shoulders of others.
"I want to acknowledge all the wonderful people who accepted me as their leader at home and so to accept this prize in a representative capacity."
The Templeton Prize has been the world's largest annual monetary award given to an individual for the past 40 years.
One of the biggest campaigns in a decade to end world hunger is being launched today, by a hundred charities across the UK.
Talking about the IF campaign to ITV Daybreak, Brendan Cox explained how previous campaigns have made amazing progress, but the one area that does need work is hunger.
He said the world's food supply needs to be redistributed and the G8 could be the moment the UK 'turns the tide' on this.