King Salman bin Abdulaziz of Saudi Arabia has been admitted to a hospital in Riyadh early Monday for medical tests, the second elderly ruler of an oil-rich Gulf Arab nation to be hospitalized in less than a week. The 84-year-old monarch was undergoing medical tests at King Faisal Specialist Hospital after being diagnosed with an inflamed gallbladder, state-run Saudi Press Agency reported, citing a statement from the royal court. There were no further details about his condition.

On Sunday, Kuwait abruptly announced that its 91-year-old emir, Sheikh Sabah Al-Ahmed Al-Sabah, was admitted to hospital the previous day for checkups and underwent a “successful surgery.” Crown Prince Sheikh Nawaf Al-Ahmed Al-Sabah temporarily assumed some of his functions and duties.

The hospitalizations of these elderly rulers add to the uncertainty that’s beset these leading oil producers as they try to battle the twin crises of crude market turmoil and the coronavirus pandemic.

Saudi Arabia pumped 10.1 million barrels of crude a day last year, 12% of the world’s total, according to BP Plc. Kuwait, OPEC’s fourth-biggest producer, pumped about 2.7 million barrels daily.

Kuwait’s Emir in Hospital for Medical Checks, Agency Says

Sheikh Sabah Al-Ahmed Al-Sabah

Photographer: CNP/Pool//Bloomberg

Salman’s hospitalization forced the postponement of Iraqi Prime Minister Mustafa Al-Kadhimi’s visit on Monday. The visit, which was to have been Kadhimi’s first foreign trip since his appointment in May, will be put off “until the King is discharged from the hospital,” the Saudi foreign minister said on Twitter.