Rosie Marcel, who played the role of Jac Naylor in Holby City, has been rushed to hospital to undergo surgery.
On Thursday, the 44-year-old London-born actress took to social media to update her fans.
In the snaps she could be seen in a hospital bed, with one of the photos showing wires and tubes connected to her.
The other saw an IV pouch full of something, and the final snap saw her feet crossed at the end of the hospital bed.
Alongside the slew of snaps, Rosie penned a caption which thanked the NHS for their care.
She penned: "Ended up at the old emergency room the other night.
"Stoke mandeville is my new local ish hospital and they were brilliant.
"Ambulance crew were amazing too. Had surgery the next day and home soon after that."
Rosie then concluded with: "Very very grateful to the nhs for looking after me and treating me quickly. #fentanyl #morphine all the good stuff!!! #nhs."
Fans of the actress were quick to wish her well, with many flocking to the comments to tell her to get well soon.
Holby City and Casualty fans were out in full force too, with one writing: "I imagine you were a better patient than the last time we saw you in hospital."
Another added: "Hope you get well soon. I bet you get some funny reactions when they see 'Jac Naylor' rock up."
"Sending thoughts for a quick and speedy recovery! I know we all wanted Jac back but you might have taken it a step too far. Hope you’re ok," chimed in a third.
While a fourth said: "You were quite well practised, glad to see it went OK and didn't end like the programme."
Rosie is famous for her role as Jac Naylor in Holby City and its sister series Casualty, and was recently written out of the two series when the former programme came to an end.
At the end of March Holby City fans were left devastated when the drama came to an emotional end after a 23 year run on the BBC.
The final episode of the programme saw Rosie's character Jac awake from a life-or-death operation to remove her brain tumour.
Jac’s final waking moment was seen scenes later, when Sacha tended to her as he said Elliot had booked her in for a scan.
He quipped: “You love me really,” as Jac replied: “You know I do,” her voice growing faint as she had a stroke, leaving the fan favourite character braindead.
Fletch later explained to Sacha, Elliot and Max the decision Jac had made as they fought to save her, saying: “She said if anything like this happened - I think she knew that something like this was coming and she made up her mind.”
As Sacha and Max broke down in emotional scenes at being unable to save her, Elliot said: “It's Jac's decision. We may not like it but we have to respect it.”
Holby City fans then learnt that Jac had decided to donate her organs, including her heart, lungs, liver and pancreas, in to order “make a difference to a lot of lives.”
In the closing moments of the show, a voiceover detailed the individuals who had received Jac’s organ donations, ranging from a medical student to a full-time mother of four.
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