Egyptian President Hosni Mubarak was to hold talks in Saudi Arabia with King Abdullah on Saturday, diplomatic sources said.
Mubarak was to "visit Saudi Arabia for a few hours for talks with King Abdullah on regional issues," they added.
According to a statement carried by the official Saudi Press Agency on Friday, King Abdullah underwent tests in the morning at the King Faisal hospital in Riyadh after a new outbreak of pain in his back.
"It appears that the herniated disc, accompanied by an accumulation of blood, is putting pressure on the nerves," the royal court statement said.
"The medical team has recommended to the king that he rests," it added.
