The Health Minister says he isn't ignoring the concerns of health staff.

A letter sent to the Prime Minister from more than 900 doctors says the workforce is at risk of catastrophic collapse.

Andrew Little says the Government has added five and a half thousand medical staff since it came into office and more graduates are on their way.

He told Mike Hosking while he won't label it a crisis, he concedes the workforce is doing it tough.

Little says the conditions some people are working under are unacceptable.

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