He was in good condition following the surgery, which began at around 12:05pm and lasted about 3 hours and 40 minutes, the official said. As Kishida was placed under general anaesthetic, chief Cabinet secretary Hirokazu Matsuno stepped in for the prime minister.

Kishida had taken medicine for the ailment but decided to get the surgery so he could concentrate on his duties unencumbered by his physical condition, the official said, adding he is scheduled to resume work as usual on Monday after post-operative care the previous day.

The premier, who returned to his residence later today after leaving the hospital at around 6.30pm, has gone to the same hospital since November, suffering from chronic sinusitis causing nasal congestion and other symptoms, the official said.

Following the surgery, Kishida said in a Twitter post that he will continue trying to tackle “many challenges at home and abroad” while ensuring “the best of health.”

Japan’s Cabinet Law stipulates that if a prime minister is prevented from carrying out his duties or the post is vacant, a state minister designated by the leader in advance will temporarily perform the role.