After 10 straight days of hiccups, Brazilian President Jair Bolsonaro was admitted to a hospital Wednesday with what doctors said was an intestinal obstruction that could require surgery. They announced later that they would not operate immediately.

Bolsonaro, 66, was admitted to the Armed Forces Hospital in the capital of Brasilia in the morning and was “feeling well,” according to an initial statement that said physicians were examining his persistent hiccups.

But hours later, the president's office said the surgeon who operated on Bolsonaro after he was stabbed in the abdomen during the 2018 presidential campaign decided to transfer him to Sao Paulo, where he underwent additional tests. By Wednesday night, the Hospital Nova Star released a statement saying the president would receive “a conservative clinical treatment,” meaning he will not go through surgery for now.

Bolsonaro, who is both Catholic and evangelical, posted on his official Twitter account a photo of himself lying on a hospital bed, eyes closed, several monitoring sensors stuck to his bare torso. At the edge of the photo, a hand reaches out from an unseen person wearing what appears to be a black religious robe and a long chain with a gold cross.

The 2018 stabbing caused intestinal damage and serious internal bleeding and the president has gone through several surgeries since, some unrelated to the attack.

In recent weeks, Bolsonaro has appeared to struggle with speaking on various occasions and said that he suffers from recurring hiccups.

“I apologize to everyone who is listening to me, because I've been hiccupping for five days now,” the president said in an interview with Radio Guaiba on July 7. He suggested that some medications prescribed after dental surgery might be the cause. "I have the hiccups 24 hours a day.” The following day, during his weekly Facebook Live session, Bolsonaro apologized again for not being able to express himself well due to the weeklong hiccups.

Chronic hiccups are usually the manifestation of an underlying problem, such as an obstructed intestine, that might require surgery, said Dr. Anthony Lembo, a gastroenterologist at Beth Israel Deaconess Medical Center in Boston. In some cases, part of the intestine might need to be removed, he said.

“Any time you're moving bowels, it's not a small surgery,” Lembo said, adding that in the case of repeated surgeries, as in Bolsonaro's case, interventions get more complicated.

Bolsonaro has been under growing pressure from a congressional inquiry into his administration's handling of the coronavirus pandemic and alleged corruption in the acquisition of COVID-19 vaccines. Recent polls have shown record-low approval ratings and indications that he could lose next year's election.

On Tuesday night, in a 20-minute encounter with the president in Brasilia, supporters repeatedly asked him to look after his health.