There's been no strike-related issues at District Health Boards around the country so far.

Thousands of junior doctors began striking for safer hours at 7 o'clock this morning - and they're not back until 8am on Friday.

It's meant senior doctors are rostered on for extra shifts to cover - and some appointments may need to be postponed.

"From what I understand everyone is coping quite well [nationally]," said Counties Manukau District Health Board spokeswoman Lauren Young.

National DHB Contingency Planner Anne Aitcheson said none of the DHBs have asked for assistance yet.

She said there'll be a country-wide conference call tomorrow morning.