Picket lines took place outside Craigavon Area Hospital, Lurgan Hospital, Portadown Health Centre and Banbridge Health Centre.
The workers are striking over a proposed 4% pay offer which they say is well below the level of inflation.
NIPSA Deputy General Secretary, Pádraig Mulholland, said: “"We must have inflation busting pay rises for all health service workers and an end to the chronic understaffing that puts lives at risk.”
13. Getting ready for the picket
Health workers at Lurgan Hospital, Co Armagh staged a 24 hour strike on Monday. Photo: Contributed
14. NIPSA is seeking a fair wage and fair mileage
Health care workers at Lurgan Hospital were among thousands across NI staging a 24 hour strike over pay. Photo: Contributed
4 / 4