Christchurch Hospital's emergency department is treating up to a dozen patients at a time in corridors, because of an unprecedented number of admissions.
Clinical director Dr David Richards says the department normally has about 250 admissions a day at this time of year, but in the past three weeks it's been more like 300.
He says the hospital has been at capacity, so on average they're having to treat 10 or 12 patients in the ED hallways, which he says is "unacceptable".
"It's unpleasant for the patients and family members, it means staff have to navigate the trolleys, and it provides very little privacy," he said.
"Obviously we try to move patients into a cubicle to examine and treat them but it's a very unsatisfactory state of affairs."