He was first admitted to treat a recurring infection and had a minor surgery for the issue.
What forced Tutu to return to the hospital, according to his wife Leah, was that the surgical wound itself was showing signs of infection.
PHOTOS: Desmond Tutu in recent years
In this photo supplied by Oryx Media retired Anglican Archbishop Desmond Tutu, left, with his wife Leah, right, at the Tutu home in Cape Town South Africa Tuesday, July 21, 2015. Tutu returned home after a weeklong hospital stay and is under doctor's instructions to rest his foundation said. (Benny Gool/Oryx Media via AP)
In this photo supplied by Oryx Media retired Anglican Archbishop Desmond Tutu, left, with his wife Leah, centre, and daughter Mpho Tutu at the Tutu home in Cape Town South Africa Tuesday, July 21, 2015. Tutu returned home after a weeklong hospital stay and is under doctor's instructions to rest his foundation said. (Benny Gool/Oryx Media via AP)
In this photo taken on Saturday, April 19, 2014, South African Archbishop Desmond Tutu, center, speaks after he marched in a rally with other religious leader under the banner of 'A Call to Witness' to parliament in the city of Cape Town, South Africa.âHow can you describe falling in love?â That is how retired archbishop Desmond Tutu this week recalled the joy of voting in South Africaâs first all-race elections on April 27, 1994, an exultant moment when a population torn by racial conflict stepped out of the shadow of the white minority rule known as apartheid. (AP Photo/Schalk van Zuydam)
FILE - In this Feb. 10, 2012 file photo Archbishop Desmond Tutu, who was awarded the Nobel Peace Prize for his part in fighting apartheid, speaks during a felicitation event for him in Dharmsala, India. Desmond Tutu checked into a Cape Town, South Africa hospital Wednesday April 24, 2013 for treatment of a persistent infection. (AP Photo/Ashwini Bhatia, File)
FILE - In this Saturday, July 4, 2015 file photo retired Anglican Archbishop Desmond Tutu, centre, breaks into dance after renewing his wedding vows to his wife of 60 years, Leah, right, during a service in Soweto, Johannesburg. Tutu will spend a second night in a Cape Town hospital, Wednesday July 15, 2015, as he continues to receive treatment for a persistent infection. (AP Photo/File)
Archbishop-elect Desmond Tutu outside his office at St. Albans Cathedral, in Johannesburg, on July 23, 1986. (AP Photo/Denis Farrel)
Archbishop-elect Desmond Tutu with President PW Botha together at the Union Buildings in Pretoria, on July 21, 1986. Tutu and Botha met for nearly two hours and discussed the state of emergency, particularly the detention of certain Anglican clergy. This was the second time that Tutu, an outspoken critic of the South African government, has met with Botha. (AP Photo/Pool)
Archbishop Desmond Tutu, right, holds out his hand as he interacts with children during celebrations of former South African President Nelson Mandela's birthday in Cape Town, South Africa, Friday, July 18, 2014. (AP Photo/Schalk van Zuydam)
IMAGE DISTRIBUTED FOR THE MO IBRAHIM FOUNDATION â Archbishop Desmond Tutu is applauded by the audience before receiving a Special Award from Mo Ibrahim at a prize ceremony organised by the Mo Ibrahim Foundation in Dakar, Senegal, on Saturday, Nov. 10, 2012. The prize honours Archbishop Tutu, recognising his lifelong commitment to 'speaking truth to power'. The Award is accompanied by a grant of $1,000,000 US dollars. (Sylvain Cherkaoui /AP ImagesÂ for The Mo Ibrahim Foundation )
FILE - In this Sunday, Nov. 27, 2011 file photo South African Archbishop Desmond Tutu speaks during a climate justice rally held in Durban, South Africa, ahead of the official start or a two-week international climate conference. Three Nobel Peace Prize laureates, including Archbishop Desmond Tutu, have contested the awarding of this yearâs prize to the European Union, saying the 27-nation bloc contradicts the values associated with the prize because it relies on military force to ensure security. In an open letter to the Nobel Foundation, Tutu of South Africa, Mairead Maguire of Northern Ireland and Adolfo Perez Esquivel from Argentina demanded that the prize money of 8 million kronor ($1.2 million) not be paid out this year. (AP Photo/Schalk van Zuydam, File)
1985 Nobel Peace Prize winner Bishop Desmond Tutu of South Africa shouts excitedly as he addressed a crowd during Africa Day at a Hamburg square on January 24, 1985. Tutu, who wore a typical northern German sailor cap, demanded self-determination for Africans in their home country. (AP photo/Proepper)
Gala honoree Archbishop Desmond Tutu speaks at the Starkey Hearing Foundation's "So the World May Hear" Awards Gala on Sunday, July 20, 2014 in St. Paul, Minn. (Photo by Diane Bondareff/Invision for Starkey Hearing Foundation/AP Images)
FILE - In this Feb. 8, 2010 file photo, South African Archbishop Desmond Tutu addresses youths during the opening ceremony of the One Young World World Summit at Old Billingsgate in London. (AP Photo/Sang Tan, File)
Archbishop Desmond Tutu participates in the State Department's observance of the first International Day of the Girl Child, Wednesday, Oct. 10, 2012, at the State Department in Washington. (AP Photo/Cliff Owen)
The new Archbishop of Cape Town, Desmond Tutu, receives the blessing from the Dean of the Province, Kenneth Cyril Oman, during the enthronement service at St. Georges Cathedral, in central Cape Town, on September 7, 1986. (AP Photo/English)
Tibetan spiritual leader the Dalai Lama, right offers a piece of his birthday cake to retired Archbishop Desmond Tutu, during an interaction with children at the Tibetan Children's Village School in Dharmsala, India, Thursday, April 23, 2015. The Tibetan leader whose birthday falls on July 6 had the advance birthday celebration as requested by Archbishop Tutu. (AP Photo/Ashwini Bhatia)
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Tutu was also tested for a persistent infection in 2013. In 2014 he cancelled travel plans following his battle with prostate cancer, which was first diagnosed in 1997.
Tutu is the first black archbishop of Cape Town. He received the Nobel Peace Prize in 1984 for his work in ending apartheid.