90% of INMO nurses have voted on industrial action.
They've voted to go on work stoppages over staff shortages, recruitment and working conditions.
The INMO says that staffing levels are still 3,500 less than in 2008 - which is impacting on patients.
The industrial action would also include a work-to-rule and nurses refusing to work beyond their rostered hours.
In addition, nurses would refuse to be redeployed from one ward to another during their working day and there would be no cross cover by community nurses.
The industrial action is unlikely to commence before the end of January.
In a statement, Health Minister Simon Harris said indsutrial action is not the solution to the challenges facing the health service.