University Hospital Galway was the country's fifth most overcrowded hospital in May.
Across the country over 9 thousand 800 patients were treated on trolleys, chairs, or other inappropriate bed spaces according to the INMO.
University Hospital Limerick was the most overcrowded, with over 2 thousand patients on trolleys.
This was followed by Cork University Hospital with 806, St Vincent's in Dublin 783, Sligo University Hospital 782 and University Hospital Galway 769.
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General Secretary of the Irish Nurses' and Midwives' Organisation, Phil Ní Sheaghdha says their members are worried about negative outcomes for patients.
