Watch: Ranvir Singh started presenting the show with swollen eyes before pulling out
The 44-year-old TV presenter started the ITV morning show at 6am on Tuesday 29 March with co-presenters Richard Madeley and Susanna Reid, wearing glasses as her eyes were so swollen she could not put in her contact lenses.
But by 7am she had left the studio and Louise James stepped in to read the news.
James revealed: "Ranvir is fine. Well, I think she's going to be fine. We think she's had a bit of an allergic reaction maybe, she's got a bit of a sore eye. She's just resting."
After Singh read the first news bulletin Madeley told her: "Hey, credit to you. You've got the worst hay fever I think I've ever seen. I thought you were going to have to stop half way through, are you alright?"
Singh replied: "I'm okay, thanks. Just streaming eyes and very sore face."
She then revealed she planned to consult GMB's resident GP Dr Hilary Jones.
Reid revealed: "We think Ranvir may have had an allergic reaction."
Singh tweeted: "Anyone else got the worst most painful stinging hay-fever they’ve ever had? I can barely keep my eyes open. If there was a vaccine for this I’d sign up asap :( "
Yahoo UK has contacted ITV for comment.
The TV presenter - who competed in Strictly Come Dancing in 2020 - is a single mother to son Tushaan, ten.
In 2020 she told Woman and Home magazine: “It’s hard work being a working single parent.
“I struggle with an enormous amount of guilt with my son and not being there when he goes to school. We’re very attached to one another because it’s just me and him.
“I do get quite tearful sometimes and I worry he’s going to hate me when he grows up because I was never there.”
Watch: Richard Madeley tells Ranvir Singh to dry her eyes as she cries on GMB