The 53-year-old assured them he was perfectly fine, captioning it: “Bad news: I’m not dying.
“I can only apologise for all the distress I know this will cause some people.”
While many of his followers wished him well, others accused him of making the whole situation up.
“You will do anything for publicity. Get well soon”
One wrote: “Why has Piers Morgan got a hospital gown on with his own clothes underneath, publicity stunt?”
A second said: “Didn’t think anyone wore anything under a hospital gown. Strange. I might be wrong though.”
Somebody else commented: “You will do anything for publicity. Get well soon.”
Piers, who tagged his location as Bupa Cromwell Hospital, could be seen wearing a patterned hospital gown with what looks like a black jumper underneath.
He also had breathing apparatus hooked around his ears leading into his nose – and he didn’t look too good.
Piers has been on social media since and revealed he’d had a gastroscopy, which involves a thin tube with a camera at the end being pushed down the throat to allow view of the stomach and part of the small intestine.
He confirmed he’d been sedated, saying: “I’m told 70% of people who have a gastroscopy opt for a sedative, and the other 30% later with they had… once they’ve recovered from violent retching and gagging.”
The telly host explained he’d been diagnosed with stomach gastritis and duodenitis, which causes pain in the stomach and small intestine.
He also jokingly revealed what he was blaming for his troubles – Brexit, Donald Trump and, shock, Greggs’ vegan sausage roll.
Piers tasted the bakery’s new snack and faked throwing it up, making it clear he wasn’t a fan.
He’d regularly been sharing his outrage at the vegan sausage roll before then, which acted as brilliant free promotion for Greggs.
Daily Star Online has contacted a representative for Piers for comment.