Argentine President Cristina Fernandez de Kirchner will undergo surgery on Tuesday to treat bleeding on her brain, doctors have said.
Ms Fernandez, 60, was earlier ordered to rest for a month after doctors discovered the subdural haematoma.
It was diagnosed as she was undergoing tests for another condition on Saturday.
This means Ms Fernandez will have to suspend campaigning for congressional elections.
The break from campaigning is considered awkward for the president as some opinion polls have suggested the government could lose control of Congress in the poll on 27 October, BBC informs.
