Although nearly 80% of its members would support going on strike against the government's 1% pay cap, the Royal College of Nursing (RCN) has chose to launch a "summer of protest activity" in the NHS instead - but industrial action is still in the cards.
The large majorities reflect growing dissatisfaction within the nursing profession over wages.
A series of summer protest events is likely, which could lead to a call for full industrial action if more RCN members come on board.
She will tell the RCN's annual conference today (Sunday) in Liverpool: "A lethal cocktail of factors in the NHS has resulted in too few registered nurses and patient care is suffering".
"They have been clear that if the next government doesn't respond and lift the unreasonable cap on nursing pay, they want us to ballot on industrial action".
Nurses say they have experienced a 14% pay cut in real terms since 2010 because of the government's cap on public sector pay.
Janice Smyth said the pay issue needed to be addressed: "Nurses in Northern Ireland have had no decision this year, about even the 1%".
Janet Davies, the RCN's general secretary, added that the vote was "unprecedented" and "a reflection of the deep anger members feel".
Nurses working in the NHS could strike for the first time in 100 years in a row over pay.
The director of the Royal College of Nursing (RCN) in Wales has told ITV News that the prospect of nurses striking over pay is "absolutely appalling". Continuing pay restraint is a disastrous, unsustainable policy for maternity services and the NHS.
"We want the Government to show all NHS staff they are valued by allowing the NHS Pay Review Body to make an unfettered recommendation on NHS pay".
Labour leader Mr Corbyn will use his RCN speech to offer a major cash boost to the NHS and deliver a warning about the health service's future if Mrs May remains in power after June 8.
A survey by the Health Foundation last month found that England could face a shortfall of 42,000 nurses by 2020, and nearly half of all nurses believe that staffing levels are already dangerously stretched.
According to the RCN, they suggest care providers have increasingly hired fewer registered nursing staff, with the number of vacant nursing posts having doubled since 2013.
He said that the Tory attitude to the NHS "feeds into a narrative of this Conservative Government treating nurses like dirt and I will not have it".
Commenting on NHS nurses pay last month, a Conservative party spokesman said: "Investment in our NHS, in additional staff and indeed in their overall pay is founded on the strong economy only Theresa May and the Conservatives can provide".