Zsa Zsa Gabor has been taken to hospital by ambulance because there is no blood flow in her left leg, her publicist says.
Publicist John Blanchette said that doctors ordered the ailing 94-year-old actress to go to UCLA Medical Centre because of the problem.
Most of Gabor's right leg was amputated in January because of gangrene.
Zsa Zsa was in hospital last month for high fever, fluid in her lungs and an infection.
Blanchette says her condition had been improving, and she watched the Oscars on Sunday with her husband.