Nearly 600 people are on trolleys today.
The INMO says the levels of overcrowding in Irish hospitals has led to a "high risk event".
592 people are on trolleys in hospitals today, with University Hospital Limerick the worst affected, followed by Cork University Hospital and St. James’s Hospital.
20 people are waiting for beds in the midlands, 17 of which are in Regional Hospital Mullingar, with the remaining three in Portlaoise.
As flu season begins, fears over the spread of infections such as Strep A, Norovirus and Covid-19 in hospitals have been raised by the organisation.
The INMO says urgent meetings are being organised in hopes of aiding members most affected before the winter.
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