2,500 resident doctors are striking across the country at 7am tomorrow, for 25 hours.

Mediation with Health New Zealand did not result in a settlement last week.

More than 2,000 doctors had been offered raises of up to 25 percent, but about 300 would have had a 12 percent pay cut.

Resident Doctors Association President James Anderson says the offer would have reduced their hourly rates.

"I think it's probably being used as a way to pay for the pay increases - I suspect they're trying to juggle the money around a little bit."

LISTEN ABOVE