In October, presidential elections are due in Brazil, with Mr Bolsonaro running for a second term.
Brazilian President Jair Bolsonaro has been hospitalised again.
Mr Bolsonaro, 67, was going to a party event in Brasilia before his hospitalisation.
He did not appear there. However, he made his way to a military hospital with stomach pain, Fabio Faria, government spokesman, said.
His wife Michelle said he was fine.
Mr Bolsonaro was taken to a hospital in Sao Paulo in January to treat an intestinal blockage.
The populist president was also treated in hospital for an intestinal blockage in July 2021. He said the problems resulted from wounds he sustained from a knife attack during the 2018 election campaign.
At the time, a mentally disturbed man stabbed him, resulting in severe abdominal injuries.
Mr Bolsonaro had to undergo several operations. In October, presidential elections are due in Brazil, with Mr Bolsonaro running for a second term.
(dpa/NAN)
