(CNN) Saudi Arabia's King Abdullah bin Abdulaziz al Saud, 90, is suffering from pneumonia, the state-run Saudi Press Agency said Friday.
The King was given a breathing-aid tube temporarily, the report said.
He was admitted to a hospital Wednesday.
There is some mystery surrounding the King's family.
His wives' names are not available publicly, but according to Islamic tradition he is allowed no more than four at a time.
The number of children he has is also not available publicly. But his sons are known to include Khalid, who died in June 2011 at age 54; Mitab; Abdulaziz; Mishal; Faisal and Badr.