Nehawu in the Free State says Health MEC M atso Mahlatsi must address hazardous working conditions at the Pelonomi Hospital in Bloemfontein or they will go on strike.
Workers also say there is a shortage of staff and beds.
Free State Nehawu Secretary, Khauhelo Mnqibisa, says their demonstration is emphasized by non-operational wards.
"The demonstration also emphasized that there is a continuous experience of critical influx of patients while operating with severe staff shortage in a form of both clinical and non-clinical staff. This pressure has been exacerbated by the closure of some wards at National Hospital, which remained non-operational since the fire incident last year. As a result Pelonomi is bearing the burden of an overstretched system leaving its limited staff overwhelmed and struggling to meet the demands of patients care."