A fan, who could not be reached for comment, wrote on the webpage that the star had spent the evening before the Tauranga concert in hospital with a swollen vocal cord and was "spitting up blood", although promoter Maria Robinson denied this.
"That's not true," she said. "He did go to hospital because he had a sore throat and he went and saw a throat specialist. It's just that his condition's deteriorated since that show.
She said the show came at the end of a demanding Australasian tour.
"You can understand he's spent a few weeks on the road singing at the top of his lungs, so unfortunately sometimes these things just happen."
All Tauranga tickets were fully refundable or fans could attend on Tuesday, she said.
That was cold comfort for Jo Clements of Rotorua. The keen fan and her sister, Fiona Wormald, had arrived outside the Tauranga show about 5.30pm and were part of the crowd chanting "Open the doors, open the doors".
They waited in front of the stage before heading out again at about 7pm, disappointed that Meat Loaf was a no-show.
"I can understand if he's sick, but I just think they would have known before 7pm," she said.
She couldn't go to Tuesday's show, but still loved his music.
In November 2007, Meat Loaf cancelled a European tour after a cyst was found on his vocal cords. His promoters were reported as saying he was suffering from "exhaustion and stress" at the time.