UHG is the second most overcrowded hospital in Ireland today with 56 people on trolleys.
Trolley Watch figures from the Irish Nurses and Midwives Organisation for today show that only Limerick is more overcrowded than UHG with 60 people on trolleys.
Trolley and Ward Watch from the INMO keep track of the number of patients on trolleys or stuck without a proper bed in overcrowded wards each day.
There are an additional 16 people without a bed at Portiuncula Hospital.
Last month UHG was the third most overcrowded hospital in the country, with 722 patients on trolleys.
INMO general secretary Phil Ní Sheaghdha has said that overcrowding remains endemic in Irish hospitals due to a lack of investment.
“If our health service doesn’t see staffing and capacity increases, conditions will only worsen for patients and staff alike,” she warned.
A new Emergency Department for UHG which has been in the works for some time is not expected to be completed until 2023.