CUH has had 300 patients waiting on beds since the turn of the year.
Carer Finbarr Murray, from Ballincollig, arrived at CUH on Saturday with the person he cares for, who required medical attention. The patient spent more than two days on a trolley before getting a bed.
Finbarr said: “The conditions are terrible, unfortunately, but the staff are doing the best they can.
“Something definitely has to be done, it was mental in there. The weekend was very, very bad. Conditions were crazy.”
Mr Murray praised the staff for their commitment and support.
“They’re just run off their feet,” he said. “More staff and beds are needed. It’s not fair to see elderly people on trolleys and in corridors waiting days for a bed.”
Meanwhile, Gerry Shine, a regular visitor to CUH with his wife, who has hip problems, also highlighted the problems.
“I dread it every time she gets sick. I absolutely dread coming up here because you know you’re in for the long haul,” he said. “The staff are brilliant but there’s only so much they can do.”