The race pits incumbent President Jair Bolsonaro against his political rival, former president Luiz Inacio Lula da Silva.
The president had an intestinal obstruction and is in stable condition, a hospital in Sao Paulo said in a statement.
Jair Bolsonaro, a far-right politician vowing a crackdown on crime and corruption, was sworn in as Brazil's new president in front of Congress in Brasilia.
Leftist icon Luiz Inacio Lula da Silva spends Sunday as Brazil's first former president to be imprisoned for money laundering and corruption.
He had been required to hand himself over by 5 pm local time, but had failed to do so. He was reportedly holed up in the metal workers union building in his hometown Sao Bernardo do Campo, surrounded by supporters.
Brazil's top prosecutor asks to investigate President Dilma Rousseff as part of a corruption investigation.
Brazilian President Dilma Rousseff decides to travel to New York for UN meeting to find support against her impreachment
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