Services at John Hunter Hospital are set to be stretched today as staff walk off the job.
About 80 to 100 workers are holding a stop work meeting from 10:30am to 1:30pm over concerns about workplace bullying which they say isn't being addressed by management.
Gerard Hayes from the Health Services Union insists patient care won't be put at risk during the industrial action.
"We will be ensuring services will be maintained, albeit they may stretched and a little bit slower," he said.
"Stop work action isn't taken lightly. I can't remember the last time it's occurred at John Hunter Hospital in my memory, so its something that's significant to our membership."
The union claims numerous letters have been sent to the Hunter New England Local Health District Board, however they've been ignored.
It's also claimed a hospital worker recently had their employment terminated unfairly.
This case is being heard before the NSW Industrial Relations Commission today.
Hunter New England Health has been sought for comment.