"Friday, 11am: hospitalised for gastroscopy on inflamed, exploding innards".
Get push notifications with news, features and more.
A second said: "Didn't think anyone wore anything under a hospital gown".
"I can only apologize for all the upset & offence I know this development will cause", Morgan, 53, continued, not sharing any details about his mystery health crisis.
It's unclear what sent Morgan to the hospital for treatment and tests.
Despite Piers' ill health, plenty of his followers couldn't resist making a couple of jokes of their own, referring back to the moment Piers was sick after eating a vegan sausage roll from Greggs on a recent episode of Good Morning Britain.
Confirming he would be back on the box for GMB on Monday morning because he doesn't "pull sickies", Piers also took issue with a follower who tweeted their hopes he was making use of private healthcare.
Piers tweeted: "If you really want to know, I was diagnosed with stomach gastritis and duodenitis".
Shortly before sharing the news that he had been hospitalized, Morgan found himself embroiled in yet another celebrity feud - this time with Sophie Turner.
He wrote: "She'll be hammered for saying this, but it's 100% true".