A statement from the Guemes hospital did not specify what Maradona was suffering from, but said his hospitalisation was "not related to an addiction to dangerous drugs".
Maradona, who led Argentina to the 1986 World Cup title, has battled cocaine addiction in the past.
"It wasn't an imbalance in his blood circulation or with his heart, but was a product of an incoherent regimen of excessive eating, drinking and smoking," Cahe said.
Maradona was likely to remain in hospital for several days, he said.
Cahe had said, just a few days ago, that Maradona had put on weight and smoked too many cigars and was planning a trip to Switzerland to get himself back in shape.
Medical history
Maradona's return to hospital was a reminder of the repeated health problems he has faced since retiring from the game in 1997.
In 2000, Maradona was hospitalised with a severe heart problem while holidaying in Uruguay and tested positive for cocaine before undergoing drug rehabilitation in Cuba.
Four years later, he spent 10 days in intensive care with heart and breathing problems and again checked in for rehabilitation.
He underwent a stomach-stapling operation in 2005, losing about 30kg. After recovering, he went on to briefly host his own television programme.
Since then he has played in several promotional football games with other retired players from across Latin America.
Maradona was suspended for drugs while playing in Italy in 1991 and kicked out of the 1994 World Cup in the US after failing a drug test, which he blamed on his coaching team for buying the wrong over-the-counter medicine.