10-thousand health support staff are on strike at 38 hospitals across the country since 8am this morning.
They're walking off the job for 24 hours as part of an ongoing pay dispute.
Chefs, cleaners, porters and maternity care assistants are among the staff that'll be on strike today.
They'll be walking off the job and onto picket lines at 38 hospitals and healthcare facilities across the country.
Contingency plans are being put in place - but thousands of inpatient procedures, outpatient appointments and surgeries are expected to be cancelled.
This dispute is over a job-evaluation scheme - and what SIPTU says is a failure to implement pay rises for the staff.
Talks between both sides over the past few weeks have failed to find a breakthrough.
And more strikes are planned next Tuesday, Wednesday and Thursday if there's no resolution.