President Cristina Fernandez said to be suffering an infection or inflammation of the colon.
Incumbent President Dilma Rousseff appears to be the favorite to win Sunday's runoff against Aecio Neves.
Brazilian Socialist Party throws support behind President Dilma Rousseff's challenger.
The decision will come on October 15, even as Madrid insists a vote on independance would be illegal.
Incumbent Dilma Rousseff wins most votes, but will need to face rival Aecio Neves in a run-off.
Ruling made as Argentina refuses to obey an order to repay the debt it owes to two U.S. hedge funds.
Weeks before an October run-off, Brazil's President Dilma Rousseff is regaining momentum.
Has been admitted to hospital with a tentative diagnosis of a tumor after suffering months of abdominal pain.
Donald Ramotar suspended the national parliament to avoid vote of no confidence in his government.
Venezuela's president will raise the minimum wage by 15% to counteract inflation rate of more than 60%.
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