The HSE has welcomed the decision taken by the INMO and PNA to suspend industrial action planned for this week.
With nurses expected to fully attend at work today, Wednesday and Thursday, it says it will endeavour to do everything it can to restore normal services.
However, this will not be possible in all areas.
It expects outpatient appointments to go ahead as planned and advise anyone with an appointment today, Wednesday and Thursday to attend.
It is advising surgical patients that they will be contacted by their hospital if their procedure is going ahead.
It expects that Emergency Departments will be extremely busy and is asking the public to only use these services if absolutely necessary.