Around 10,000 hospital workers went on strike from 8am on Wednesday.
Industrial action planned by SIPTU workers will affect patient and client services across 38 hospitals and healthcare facilities.
The workers include catering staff, porters, cleaners and technicians.
The dispute has emerged between workers and the HSE over what SIPTU claims is a failure to implement increases in pay for workers after a job evaluation scheme deemed the staff were underpaid.
The initial response from the Government was that the increase would be paid in 2021 when all the stages of the evaluation are complete.
A list of the affected hospitals is as follows:
- Cork University Hospital
- Cork University Maternity Hospital
- Kerry University Hospital
- Mallow General Hospital
- South Infirmary Hospital Cork
- South Tipperary General Hospital
- Wexford General Hospital
- St Lukes Hospital Carlow/Kilkenny
- Mercy Hospital Cork
- Connolly Hospital Blanchardstown
- National Rehabilitation Hospital
- Beaumont Hospital
- St Ita’s Portrane
- Mater Hospital
- St James Hospital
- St Vincent’s University Hospital
- Tallaght Hospital
- Our Lady’s Hospital Navan
- Louth County Hospital
- Our Lady of Lourdes Hospital Drogheda
- Our Lady’s Children’s Hospital Crumlin
- Rotunda Hospital
- Central Mental Hospital
- Midland Regional Hospital Mullingar
- Midland Regional Hospital Tullamore
- Midland Regional Hospital Portlaoise
- Naas General Hospital
- Cavan General Hospital
- Letterkenny University Hospital
- Sligo General Hospital
- Roscommon Hospital
- Portiuncula Hospital Ballinasloe
- Galway University Hospital
- Merlin Park
- Mayo University Hospital
- UL Hospital Dooradoyle
- UL Maternity Hospital
- UL Orthopaedic Hospital Croom
Taoiseach Leo Varadkar says that in order to come to a deal the Government had agreed to phase-in these pay increases from November 2019, "out of good will", in an effort to resolve the dispute, which was not accepted by the union.
SIPTU Health Divisional Organiser Paul Bell said the trade union would prefer a negotiated settlement that does not impact on patient services.