In scenes that didn't air on the show, Coleen was treated by medics in the Diary Room and taken to hospital in an ambulance before Friday's final live show.
"I thought it was heartburn but the chest pains were really bad and I was shaking," Coleen recalled of suffering terrible chest pains while in the house.
"They called me into the Diary Room and they called a paramedic and they did two ECGs and they were fine," she said while on ITV's Loose Women today.
An ambulance was eventually called to take Coleen to hospital.
"I thought they were evicting me out the back door," quipped Coleen. "I was taken with a blanket over my head because no-one was allowed to see me."
Coleen said she was now absolutely fine, putting the incident down to the stress of the house... and the constant booze meaning she was "drunk for 32 days".
Coleen wasn't the only celeb to make a departure from the house this year.
Chloe Ferry secretly left the Celebrity Big Brother house before her eviction in order to film scenes for Geordie Shore.
Eagle eyed viewers noticed during one of the nightly highlights show that Chloe was mysteriously missing before being evicted.
A source later revealed: "Chloe left the house for prearranged commitments.
"At the time of leaving she was chaperoned by a member of production and had minimal contact with the outside world."
Over the years a number of celebs have left the CBB house, and not just for medical reasons.
In 2013, TOWIE star Mario Falcone was spotted out in London when he went to get a visa while Rylan Clark-Neal also left in order to rehearse for The X Factor tour.
Celebrity Big Brother will return in the summer on Channel 5.