The husband of Nazanin Zaghari-Ratcliffe has said his wife has been taken to the hospital wing of her prison after she "blacked out".
Mr Ratcliffe said she spoke yesterday of a headache and feeling numbness in her legs and numbness in her right arm and a rash.
He also said that she had been suffering “panic attacks”.
"What I do know is that she had a panic attack yesterday in prison and she had another panic attack today, and today she also blacked out,” he said.
“So today she was taken down to the prison clinic and as far as I know that's where she is still.
Some reports appeared that she had been moved to an external hospital, but Mr Ratcliffe has said he “hasn’t had those confirmed.”
He also said one of the other prisoners called for help, adding: "We're clearly very, very worried."
"She certainly, when I spoke to her on the phone yesterday morning, she was devastated and it was amongst the hardest phone calls I've had with her, just really sad. Yes, gutted.
"They'll be trying to assess how serious they think it is but the fact that it's happened now two days in a row, and that she passed out, yes, they'll be worried, as are we."
He added he would wait by the phone and the family had been in touch with the British Embassy.
"It's been such a whirlwind this past few (days), just keeping up with events."
Her four-year-old daughter Gabriella, he said had been due to have a family visit today.
"We don't know if that family visit has been cancelled yet."