The 41-year-old collapsed in the public waiting room of a Garda station yesterday morning and was taken to St Luke’s hospital, where was said to be comfortable.
His mother, Maura Carey, said the family did not know anything definite about the cause of his illness. But she said he was not in immediate danger.
“He’s comfortable, that’s all that we know,” she said.
Carey won five All-Ireland medals and is regarded as one of the most naturally gifted forwards of all time.
The non-smoker and non-drinker has endured a traumatic period following the collapse of his cleaning businesses, inquiries he called for into suspected fraud at his former companies, and the breakup of his relationship to businesswoman Sarah Newman.
Mr Carey has two sons, Michael and Sean, and was married to Christine until they separated nine years ago.
A native of Gowran in Kilkenny, he twice retired from intercounty hurling, having reversed his first decision to quit following an incredible campaign from his supporters.
Denis Quinlan, chairman of the Young Irelands club in Gowran, said all his friends were wishing him a speedy recovery. “He had some sort of a turn as far as we can gather. But he’s seemingly comfortable in hospital. Whatever happened, we wish him a quick recovery,” he said.
Carey separated from his partner, Ms Newman, in recent weeks. Last year they had judgements of €9.5m registered against them by AIB for the guarantees they provided for each other’s loans. These had been secured against properties at the high-end golf resorts the K Club and Mount Juliet.
Ms Newman had also bought a luxurious chateaux in Switzerland which was sold last year.
Carey’s cleaning businesses went into liquidation in early 2011 owing €1.7m. He began these in 1994.
He was one of the most decorated hurlers of all time, and won 10 provincial medals and nine All-Star commendations alongside his All-Ireland medals.
He was twice named hurler of the year.
Gardaí have been investigating suspicions of fraud at his companies after Ms Newman raised concerns about how money was being spent. This inquiry is ongoing.