The clip showed Vorderman, 61, wrapped in a white robe as she told her fans: "Well, I'm four days into the flu thing.
"Oh God, I feel rough. I look it.
"I haven't brushed my hair in four days though, so excuse that. Anyway, thank you for all your lovely messages."
Coughing, she went on: "Sorry, I won't be on This Morning this morning. I was looking forward to it as well.
"Eh, it will be better be soon."
"I need a cup of tea," the TV star added.
Vorderman captioned the video: "FOUR DAYS INTO A FLU THING.
"Just sorry I won't be joining you on @thismorning... was really looking forward to it with my big bad handsome partner in crime @gylesbrandreth.
"Still it means I haven't had to brush my hair for 4 days which is always a bonus."
Thanking her fans, she added: "You're a lovely lot."
Vorderman was inundated with get well soon posts from her followers and celebrity friends.
Dame Kelly Holmes posted: "I hear you… Just came on here and seen your post. Oh boy I’m the same! Been up all night non stop coughing!
"Get well soon lovely."
Vorderman replied: "Oh no Kelly. I think we're in sync on this.
"Knackered but my brain has gone into laughing mode. It's a bloody weird brain I've got xx.
"Someone on Twitter said to put Vicks Vapor rub on your feet so I've pulled some socks out of the wash basket and rubbed my feet down with it and sitting here stinking but happy."
Watch: Carol Vorderman shares NSFW nickname for Matt Hancock