Mubarak, a former air force chief, ruled Egypt for nearly 30 years.
He was forced out of office following 18 days of street protests that gripped Egypt as part of the Arab Spring revolts.
Mubarak was ousted in 2011 following mass protests against his autocratic rule and he was the first leader to face trial after the Arab Spring uprisings that swept the region.
Mubarak was freed in 2017 after he was cleared of the final murder charges against him.
On Saturday, his son Alaa wrote on Twitter that Mubarak was in intensive care.
The toppled president underwent surgery in January, Alaa said, without giving details. (dpa/NAN)No tags for this post.