Richard Ratcliffe has told Sky’s foreign affairs correspondent Lisa Holland that his wife has collapsed.
He added that she is now in the prison clinic where she is undergoing tests.
Mr Ratcliffe, who has been campaigning for his wife’s release, said that the mother-of-one had a panic attack on Tuesday.
He added that his Mrs Zaghari-Ratcliffe collapsed and passed out after suffering another panic attack on Wednesday.
Mr Ratcliffe said that she had been complaining of headaches and that she had been “feeling down”.