Junior health minister Kathleen Lynch has been taken into intensive care after becoming ill on an official visit to a hospital.
The Labour TD complained of feeling unwell as she was leaving Letterkenny General Hospital in Co Donegal which was flooded over the weekend.
Senator Jimmy Harte, who was with Ms Lynch at the time, said he expects she will be kept under medical care for at least a few days.
"There happened to be a consultant close by who she was talking to when she started to feel unwell and he brought her in and she was admitted," he said.
"She was only about 10 yards from a treatment room at that stage. She will probably in for a few days. She is in good hands, I wish her well and hope she makes a full recovery shortly."
Ms Lynch's husband Bernard, who is her personal assistant, was with her at the time and is at her bedside. It is understood Ms Lynch spent some time in hospital in recent months for a medical complaint.
The Minster of State for Disability, Equality and Mental Health was visiting the psychiatric unit of Letterkenny General Hospital, with Mr Harte, Letterkenny town mayor Pascal Blake and hospital consultants, when she took sick.
A Labour spokesman said Ms Lynch's husband Bernard confirmed she was responsive and talking to doctors. "Doctors felt the best place for her to be was in hospital to get some treatment," he said. "But Bernard said she seems to be doing fine and she'll be kept in no longer than a couple of days."
The spokesman said he was not aware of Ms Lynch having any pre-existing condition.
The spokesman later confirmed that Ms Lynch was transported by air ambulance to Cork University Hospital where she will undergo further tests and treatments. He described her condition as comfortable.