Galway University Hospital is the most overcrowded in the country today, with 43 patients waiting for admission to a bed.
Across the country, there are 510 people on hospital trolleys today, according to the INMO.
43 of these are at UHG where two of the patients waiting for a bed are children.
There are 23 patients on trolleys at Sligo University Hospital and 16 at Mayo University Hospital.
Meanwhile, the INMO has denied that they are looking for a 12 per cent pay increase for nurses and midwives.
They're calling for pay parity with other health service staff who have the same level of qualification.
The Department of Public Expenditure says that would amount to a 12 per cent increase, and cost 300 million euro.
It comes as the INMO are to ballot for strike action next week, unless progress on a pay increase is made.