Several court cases were forced to reschedule after a number of higher court judges fell sick from a stomach bug after attending a conference at a luxury hotel last week.

Eighteen judges out of 53 that attended a two-day conference at North Island's Chateau Tongariro Hotel last week, contracted a gastro bug, judicial office spokesperson confirmed.

The spokesperson said the bug was "short-lived" but the cause of it was unclear.

All judges were recovered or had nearly recovered, she said.

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Three Court of Appeal cases and about two Wellington High Court cases were in the process of being rescheduled.

A room at the Chateau Tongariro Hotel can cost as much as $400 a night.