Hundreds are estimated to have been killed during the protests as police opened fire and cracked down on the crowds. Officials put the number of protesters killed during the uprising at 365, but human rights activists and others have said the figure is much higher. According to a count by the Front to Defend Egypt Protesters, a group that provides medical and legal assistance to the demonstrators, 685 people died as of March 7.
Authorities are now investigating government officials for their role in ordering the violence.
Gamal is also seen as the architect of Egypt's privatization program and economic liberalization, which has brought in billions in foreign investment but has also widened the gap between rich and poor.
Many of his close associates were billionaires and held top positions in the ruling party and the government. There are allegations that they used their positions for personal gain.
Mubarak arrived late Tuesday under heavy police protection to the main hospital in Sharm el-Sheikh and stepped out of his armored Mercedes unaided before being taken to the presidential suite in the pyramid-shaped building, according to doctors and security officials at the hospital who also spoke on condition of anonymity because they were not authorized to speak to the media.
Soon after the hospitalization and in a sign that his ailment might not be very serious, Justice Minister Mohammed el-Guindi said Mubarak was then questioned in his suite for his role in the violence against protesters. The ministry statement on Facebook said Mubarak's lawyers and a medical team were present during the interrogation.
The investigation into corruption charges would be carried out later by the Justice Ministry's anti-corruption department, he added.
The protest movement that deposed Mubarak had long pushed for him to be brought to justice for what they say are decades of abuse.