There are 530 people waiting for beds in hospitals nationwide on Wednesday morning.
University Hospital Limerick is the worst affected by overcrowding, with 121 patients on trolleys.
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That is followed by 71 at Cork University Hospital, and 44 at both University Hospital Galway and the Mater Hospital in Dublin.
Figures from the Irish Nurses and Midwives Organisation show 372 patients are in emergency departments, while 158 are in wards.
