UHG is the most overcrowded hospital in the country today.
There are 62 patients waiting on trolleys, according to the INMO.
It's followed by 56 at University Hospital Limerick, and 36 at Cork University Hospital.
It comes amid rising levels of flu cases, with the HSE advising everyone eligible to get a flu vaccine or Covid booster.
Meanwhile, there's just one patient without a bed at Portiuncula Hospital in Ballinasloe.