Shane Jones has confirmed he's suffering from exhaustion, but says he's otherwise fine.

The New Zealand First MP was taken to hospital this afternoon as a precaution, after feeling light-headed.

Jones has thanked National MP Shane Reti and fellow New Zealand First MP Jenny Marcroft, who came to his aid - and is thanking people for their good wishes.

A spokesperson earlier confirmed the Minister was taken to hospital.

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The NZ First MP was seen leaving Parliament in a wheelchair this afternoon.

Jones was answering journalists' questions before going into the House today at 2pm.

It is understood that Jones started to fell unwell during Question Time.

Reti, the MP for Whangarei and a doctor, was asked to take a look at Jones and recommended he be sent to hospital for tests.

Speaking to the Herald, NZ First Leader Winston Peters said Jones had been working extraordinary hard over long hours, day after day without breaks.

"It's a case of exhaustion I think, and we will find out."

He is waiting for more information.

NZ First MP Clayton Mitchell declined to comment, saying only: "I understand he's well and fine and just needing a bit of rest."

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A spokeswoman for Wellington Free Ambulance confirmed that it had transported one person in moderate condition to Wellington hospital this afternoon.