For the second day in a row, there are 760 patients on hospital trolleys across the country today - matching yesterday's record figure.
According to the INMO, Limerick is the worst-hit hospital with 75 patients on trolleys, followed by Galway University Hospital where 51 patients are waiting for a bed today.
Elsewhere across the region, there are 14 patients on trolleys at Mayo University Hospital, 20 in Sligo and 21 at Portiuncla Hospital in Ballinasloe.
The Irish Nurses & Midwives Organisation says this extreme overcrowding presents a clear danger to both patients and staff, and requires immediate political intervention to stabilise our hospitals.
The union has written to the Health Minister Simon Harris, calling for a major incident to be declared at the worst-affected hospitals.
The INMO is also calling for the immediate approval of all nursing posts across the acute hospitals, an end to the recruitment ban, the cancellation of elective procedures in the worst-affected hospitals and the sourcing of additional beds in the private and voluntary sector.
In relation to Mayo University Hospital, local TD Lisa Chambers has described as "cruel and inhumane" the conditions patients and staff are dealing with in the Emergency Department.