He was admitted to a military hospital in the capital Brasília on Wednesday, as he has been hiccuping since July 3 when he made a dental implant.
According to a statement from the presidential palace, he will be transferred to a hospital in São Paulo, where doctors will decide if he needs surgery.
The president has complained about his hiccups several times in recent days.
"I have been hiccuping 24 hours a day," Bolsonaro said in a radio interview last week.
"People, my voice has disappeared.
If I start talking, the hiccup will come back.
.
.
it has already done so, "he told supporters gathered outside his home on Tuesday.
Bolsonaro has been operated on several times due to injuries he received when he was stabbed in the stomach during an election campaign meeting in 2018.
According to a statement, his health problems are due to a kind of intestinal upset.