Almost 14,000 people are on hospital waiting lists in Sligo University Hospital.
They're waiting for inpatient or outpatient care - with a total of 2,500 waiting at least a year.
Figures from the Irish Nurses and Midwives Organisation also reveal 663 people were on trolleys in the hospital last month.
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Independent Councillor Des Guckian, from Dromod, says there are serious problems in the hospital.