Over 1,900 people left Sligo's emergency department last year without finishing their treatment.
Over 48,000 patients went to the hospital's ED in 2025 - and 4 per cent did not wait to finish their treatment.
The national average in HSE hospitals was 6.6 per cent.
Sinn Fein TD for Sligo-Leitrim, Martin Kenny, says overcrowding is the main reason why people leave: