Brazilian President Jair Bolsonaro has been taken to hospital for tests after suffering persistent hiccups, his office says.
He is expected to remain under observation for 24 to 48 hours, but not necessarily in hospital.
A statement by staff said he was "feeling good and doing well".
There have been concerns about the far-right leader's health since he was stabbed in the intestines while campaigning in 2018.
Mr Bolsonaro was seriously wounded in the attack and lost 40% of his blood.
He has had several operations since the stabbing.
Medical experts say the hiccups could be related to irritation of the esophagus following abdominal surgery.
Media reports say he has also been suffering abdominal pains.
After two-and-a-half years of a controversial presidency, Mr Bolsonaro is under growing pressure over his handling of the Covid-19 pandemic.
At the beginning of the month, tens of thousands of people took to the streets to protest over allegations of corruption involving the purchase of vaccines.
