Tallaght Hospital has cancelled some non urgent surgery and day care procedures due to overcrowding.
The issue at the facility has been highlighted by unions for some months.
The Irish Nurses and Midwives Organisation says that it has grave concerns that it can't deliver safe patient care due to overcrowding and staffing levels.
A meeting with management to discuss the problems is due to take place tomorrow morning.
INMO Industrial Relations Officer Derek Reilly says the hospital is full to capacity..