Boris Johnson had been suffering with food poisoning and was sick on his suit before being "beaten up" by Susanna Reid on Good Morning Britain.
The Prime Minister's aides also had a 'distress signal' arranged for him in case he needed to end the car crash interview.
Boris, 57, appeared on the breakfast programme for the first time in five years to justify the government's response to the soaring cost of living.
"He had food poisoning," one of his team told the Sunday Times.
"He was throwing up and had to change his suit because he got sick on his lapel."
It is believed that after, the PM went to his senior aides and told them: "I just got beaten up by Susanna Reid."
Boris had reportedly refused to appear on the show while Piers Morgan was presenting.
On one occasion he famously hid in a fridge when a reporter from the show tried to confront him during the 2019 general election.
The presenter hit Mr Johnson with the real life example of Elise, whose energy costs in her council flat have risen from £17 to £85 a month.
Things are so tough for the 77 year old that she "uses her freedom bus pass to stay on buses all day to avoid using energy at home".
"I don't want Elsie to cut back on anything, let's talk about Elsie and what we are doing and - just to remind you that the 24-hour freedom bus pass was something that I actually introduced."
Stunned by his tone deaf response, she hit back and said: "So Elsie should be grateful to you for her bus pass? What else should she cut back on?"
Mr Johnson went on: "There are plenty of things more that we are doing.
"What we want to do is make sure we have people who are in particular hardship looked after by their councils, we are putting much more money into local councils.
"We have the particular payments to help elderly people in particular with the cost of heating."
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Although, his claims were met with criticism as the freedom pass was brought in in 1973, but Mr Johnson extended it so users could benefit from it 24 hours a day.
Viewers were amused after the PM didn't know who Lorraine Kelly was.
As Susanna introduced the next show, he asked: "Who's Lorraine?"
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