The BBC is reporting that Mr. Muntadar al-Zaidi is being tortured.
Muntadar al-Zaidi has allegedly suffered a broken arm, broken ribs and internal bleeding, his older brother, Dargham, told the BBC.
Mr Zaidi threw his shoes at Mr Bush at a news conference, calling him “a dog”.
A spokesperson for the Iraqi military says the journalist is in good health and said the allegations were untrue.
It is unclear whether the reporter may have been injured when he was wrestled to the floor at the news conference, or at a later point.
The head of Iraq’s journalists’ union has asked the government for clemency towards the journalist who is still in custody.
A spokesman for Iraq’s High Judicial Council said that Mr Zaidi, accompanied by defence and prosecution lawyers, had been brought before the investigating judge, Reuters news agency reported.
Abdul Satar Birqadr said Mr Zaidi had been charged with aggression against a president.
“He admits the action he carried out,” the news agency quoted Mr Birqadr as saying.
Earlier, Dargham al-Zaidi told the BBC’s Caroline Wyatt in Baghdad he believed his brother had been taken to a US military hospital in the Iraqi capital.