The 91-year-old Hollywood veteran is said to have previously been admitted to a private hospital in Toulon in early October to undergo surgery related to a mystery illness but she was later discharged to continue her recovery at her home in Saint-Tropez.
However, French publication Nice-Matin now reports Bardot has been rushed back to the Saint-Jean Hospital.
The newspaper said Bardot was admitted to the clinic and has spent the last 10 days under the care of doctors.
The latest health scare comes just weeks after the actress was forced to deny rumours which suggested she had died.
Bardot posted a statement on her X account to dismiss claims made by influencer Aqababe in a now-deleted social media post suggesting she had passed away.
The actress wrote: "I don't know who the idiot who started this 'fake news' about my disappearance but know that I am doing well and I have no plan on taking my bow. A word to the wise."
Aqababe, whose real name is Aniss Zitouni, claimed in their post that they had "exclusive information" about the star's supposed death.
The deleted post read: "Her coffin was ordered in Saint-Paul-de-Jarrat in the 09 (Ariège) department. An icon has passed away, leaving behind an unforgettable legacy and an internal imprint on the hearts of the French."
The influencer even stood by the claims after Bardot issued her denial on X, suggesting it is not the former actress who runs her account.
Aqababe wrote: "I deleted my exclusive tweet about Brigitte Bardot's death. It's not her who manages her Twitter, you'll see when AFP officially announces the death."
Bardot previously suffered another health scare back in July 2023 she experienced respiratory problems amid the soaring temperatures in Saint-Tropez over that summer.
The actress was attended to by medics at her home.
Her husband Bernard d'Ormale told Var Matin at the time: "It was around 9am when Brigitte had trouble breathing."
He described the health scare as a "respiratory distraction", saying: "(Her breathing) was stronger than usual but she did not lose consciousness. Let's call it a moment of respiratory distraction."
Bernard - who has been married to the icon since 1992 - added: "Like all people of a certain age, she can no longer bear the heat. It happens at 88 years old. She must not make unnecessary efforts."
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