The surgery was performed early Sunday, Minister of Royal Court Affairs Ali Al-Jarah said without giving details, according to state news agency KUNA.
On Saturday, Emir Sabah was admitted to the hospital for unspecified medical check-ups, KUNA said.
A royal order was issued later in the day tasking Crown Prince Nawaf Al-Ahmad Al-Jaber Al-Sabah with temporarily taking over some "constitutional jurisdictions" of the emir.
Emir Sabah has ruled oil-rich Kuwait since 2006.
Last year, he was transferred to hospital in the United States during a trip there.
Although Kuwait has one of the Arab world's most active parliaments, the emir retains the most power, including the right to appoint the government.
On Saturday, Emir Sabah was admitted to the hospital for unspecified medical check-ups, KUNA said.
A royal order was issued later in the day tasking Crown Prince Nawaf Al-Ahmad Al-Jaber Al-Sabah with temporarily taking over some "constitutional jurisdictions" of the emir.
Emir Sabah has ruled oil-rich Kuwait since 2006.
Last year, he was transferred to hospital in the United States during a trip there.
Although Kuwait has one of the Arab world's most active parliaments, the emir retains the most power, including the right to appoint the government.