Around 1,500 ambulance service workers are to be balloted over industrial action and a vote of 'no confidence' in the Welsh Ambulance Trust.
The Unite union, which represents around 500 people, has already sent a letter asking its members if they would support industrial action. Today, the GMB union, representing around 1,000 people joined them. It will now start the process of balloting its members over strike action. Paul Gage from GMB says staff have 'had enough.'
Union officials have told ITV News that levels of disquiet have become so heightened that they had no option other than consulting members.
The main issues have been around meal breaks, long hours, training on new equipment and pressures on the system.
The Welsh Ambulance Service has not met response times to the most urgent calls for almost two years.
It should be known whether a vote of 'no confidence' will go ahead by the end of the month, but a ballot over strike action will take longer.